Answer:
no answer
Step-by-step explanation:
of 15 windup toys on a sale table, 4 are defective. if 2 toys are selected at random, find the expected number of defective toys.
By using probability, the expected number of defective toys when selecting 2 toys at random from the table is 8/15.
To find the expected number of defective toys when selecting 2 toys at random from a table of 15 windup toys, we can use the concept of probability. There are a total of 15 toys, and 4 of them are defective. Thus, the probability of selecting a defective toy in the first pick is 4/15.
Once we have picked one toy, there are now 14 toys remaining on the table. If the first toy was defective, there are now 3 defective toys left among the 14. If the first toy was not defective, there are still 4 defective toys left among the 14.
The expected number of defective toys can be calculated as the sum of the probabilities of each possible outcome, multiplied by the number of defective toys in that outcome. There are two possible outcomes: (1) both toys are defective or (2) only one toy is defective.
(1) Probability of both toys being defective:
(4/15) * (3/14) = 12/210
(2) Probability of only one toy being defective:
a) First toy is defective, second toy is not: (4/15) * (11/14) = 44/210
b) First toy is not defective, second toy is: (11/15) * (4/14) = 44/210
The expected number of defective toys is the sum of the probabilities multiplied by the number of defective toys in each outcome:
(2 * 12/210) + (1 * 44/210) + (1 * 44/210) = 24/210 + 88/210 = 112/210
Simplifying the fraction, we get: 112/210 = 8/15.
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7
A linear function has a slope of -g and a y-intercept of 3. How does this function compare to the linear function that is
represented by the equation y+11--(x-18)?
O It has the same slope and the same y-intercept.
OIt has the same slope and a different y-intercept.
O It has the same y-intercept and a different slope.
O It has a different slope and a different y-intercept.
Comparing the two functions, we see that they have the same slope (-7/g), but different y-intercepts (3 vs 145/g). Therefore, the correct answer is: It has the same slope and a different y-intercept, which is option (b).
What is linear function?A linear function is a numerical capability that can be addressed by a straight line on a chart.
It has the structure y = mx + b, where m is the slant of the line and b is the y-catch.
Modeling relationships between two variables with a constant rate of change is done with the help of linear functions.
The linear function with a slope of -7/g and a y-intercept of 3 can be represented by the equation y = (-7/g)x + 3.
The linear function represented by the equation y + 11 = (-7/g)(x - 18) can be rewritten in slope-intercept form as y = (-7/g)x + 145/g.
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how is the distance to a star related to its parallax?question 3 options:distance is inversely proportional to parallax squared.distance is directly proportional to parallax squared.distance is directly proportional to parallax.distance is inversely proportional to parallax.
The distance to a star is inversely proportional to its parallax.
The distance to a star is related to its parallax through the following relationship: distance is inversely proportional to parallax. In other words, as the parallax increases, the distance to the star decreases, and vice versa.
This means that as the parallax angle (the apparent shift in position of the star when viewed from different points in Earth's orbit) decreases, the distance to the star increases. In other words, the smaller the parallax angle, the farther away the star is. This relationship is often expressed as the distance to the star being proportional to the reciprocal of its parallax angle, or distance ∝ 1/parallax.
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Assume that in your hand you hold an ordinary six-sided die and a dime. You toss both the die and the dime on a table. Answer the following:
(Enter probabilities in decimal form and rounded out to 4 decimal places.)
a. What is the probability that a tails appears on the dime and a 1 on the die?
Spell check
b. What is the probability that a tail appears on the dime and any number 4 or greater on the die?
Spell check
c. What is the probability that a number greater than 2 appears on the die?
Spell check
d. What is the probability that a head appears on the dime or you throw a 3 on the die?
a. The probability that a tails appears on the dime and a 1 on the die is 0.0833. To find this, you need to multiply the probabilities of each individual event: P(tails) = 0.5 and P(1 on die) = 1/6. So, 0.5 * (1/6) = 0.0833.
b. The probability that a tail appears on the dime and any number 4 or greater on the die is 0.2500. First, find the probability of getting a 4 or greater on the die: P(4 or greater) = 3/6 = 0.5. Then multiply by P(tails): 0.5 * 0.5 = 0.2500.
c. The probability that a number greater than 2 appears on the die is 0.6667. There are 4 numbers greater than 2 (3, 4, 5, and 6), so the probability is 4/6 = 0.6667.
d. The probability that a head appears on the dime or you throw a 3 on the die is 0.5833. To find this, add the individual probabilities and subtract the probability of both events happening: P(heads) = 0.5, P(3 on die) = 1/6, and P(heads and 3 on die) = 0.0833. So, 0.5 + (1/6) - 0.0833 = 0.5833.
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Animal populations are not capable of unrestricted growth because of limited habitat and food
supplies. Under such conditions the population growth follows a logistic growth model.
P(t)= d/1+ke^-ct
where c, d, and k are positive constants. For a certain fish population in a small pond d = 1200, k
= 11, c = 0.2, and t is measured in years. The fish were introduced into the pond at time = 0.
a) How many fish were originally put into the pond?
b) Find the population of fish after 10, 20, and 30 years.
c) Evaluate P(t) for large values of t. What value does the population approach as →[infinity]?
a) 100 fish were originally put into the pond.
b) After 10 years, the population of fish is≈780.33 fish.
after 20 years, it is≈1018.31 fish.
and after 30 years, it is≈1096.94 fish.
c) The population of fish approaches a constant value of 1200 fish as t becomes very large.
What is the logistic growth model and how is it used to describe a fish population in a small pond?a) To find how many fish were originally put into the pond, we need to find the initial population at time t=0.
We can do this by substituting t=0 in the logistic growth model:
P(0) = d / (1 + k[tex]e^{(-c0)}[/tex])P(0) = d / (1 + k*e⁰)P(0) = d / (1 + k)P(0) = 1200 / (1 + 11)P(0) = 100Therefore, 100 fish were originally put into the pond.
b) To find the population of fish after 10, 20, and 30 years, we can simply substitute the values of t in the logistic growth model:
P(10) = 1200 / (1 + 11[tex]e^{(-0.210)}[/tex]) ≈ 780.33 fishP(20) = 1200 / (1 + 11[tex]e^{(-0.220)}[/tex]) ≈ 1018.31 fishP(30) = 1200 / (1 + 11[tex]e^{(-0.230)}[/tex]) ≈ 1096.94 fishTherefore,
The population of fish after 10 years is approximately 780.33 fish, After 20 years is approximately 1018.31 fish, After 30 years is approximately 1096.94 fish.c) To evaluate P(t) for large values of t, we need to find the limit of P(t) as t approaches infinity. We can do this by looking at the behavior of the exponential function [tex]e^{(-ct)}[/tex] as t becomes very large.
As t approaches infinity, [tex]e^{(-ct)}[/tex] approaches 0, so we can simplify the logistic growth model as follows:
lim P(t) as t → infinity = lim d/(1 + k[tex]e^{(-ct)}[/tex]) as t → infinity= d/(1 + k0) (since [tex]e^{(-ct)}[/tex] → 0 as t → infinity)= dTherefore, the population of fish approaches a constant value of 1200 fish as t becomes very large.
This is known as the carrying capacity of the pond, which is the maximum number of fish the pond can sustain.
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Find the measure of angle A to the nearest tenth
(Show work if you can pleasee)
Answer:
19.5°
Step-by-step explanation:
to get the answer to this, you need to apply trigonometry
SOH CAH TOA
label the sides of the triangleAB = hypotenuse
BC = opposite
AC = adjacent
read the question to see what you want to work out (in this case the angle A)look at the sides that you have and correspond this to what equation to use
we have the hypotenuse and the opposite so we use the equation SOH
the equation to work out the anglesin⁻¹ (opp/hyp)
= sin⁻¹ ([tex]\frac{6}{18}[/tex])
= 19.47122....
= 19.5° (to the nearest tenth)
A classroom of children has 16 boys and 19 girls, in which five students are chosen at random to do presentations. What is the probability that more boys than girls are chosen?
The probability that more boys than girls are chosen is approximately 0.171.
To solve this problem, we can use the binomial distribution. Let X be the number of boys chosen out of the 5 students selected.
Then, X has a binomial distribution with parameters n = 5 and p = 16/(16+19) = 16/35, since there are 16 boys and 19 girls, and we are selecting 5 students at random.
We want to find the probability that more boys than girls are chosen, which is the same as the probability that X is greater than 2. We can compute this probability using the cumulative distribution function (CDF) of the binomial distribution:
P(X > 2) = 1 - P(X ≤ 2)
= 1 - (P(X = 0) + P(X = 1) + P(X = 2))
Using the binomial probability formula, we can calculate each term of the sum:
P(X = k) = (n choose k) * p^k * (1 - p)^(n - k)
where (n choose k) = n! / (k! * (n-k)!) is the binomial coefficient.
Thus, we have:
P(X = 0) = (5 choose 0) * (16/35)^0 * (19/35)^5 = 0.107
P(X = 1) = (5 choose 1) * (16/35)^1 * (19/35)^4 = 0.349
P(X = 2) = (5 choose 2) * (16/35)^2 * (19/35)^3 = 0.373
Substituting these values into the formula for P(X > 2), we get:
P(X > 2) = 1 - (0.107 + 0.349 + 0.373) = 0.171
Therefore, the probability that more boys than girls are chosen is approximately 0.171.
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3.18 steph curry is a 91ree-throw shooter. he decides to shoot free throws until his first miss. what is the probability that he shoots exactly 20 free throws (including the one he misses)
The required answer is P(X=20) = 0.0919
To find the probability that Steph Curry shoots exactly 20 free throws (including the one he misses), we can use the binomial distribution formula:
P(X=k) = (n choose k) * p^k * (1-p)^(n-k)
Where:
- X is the number of successes (made free throws)
- k is the specific number of successes we are interested in (20)
- n is the total number of trials (free throws attempted)
- p is the probability of success (making a free throw)
Since Steph Curry is a 91% free-throw shooter, we know that p = 0.91. We also know that he will keep shooting free throws until he misses, which means that the number of trials is not fixed. However, we can still use the formula by setting n = 20 (the maximum number of free throws he could make before missing).
A probability is a way of assigning every event a value between zero and one, with the requirement that the event made up of all possible results (in our example, the event {1,2,3,4,5,6}) is assigned a value of one. To qualify as a probability, the assignment of values must satisfy the requirement that for any collection of mutually exclusive events (events with no common results, such as the events {1,6}, {3}, and {2,4}), the probability that at least one of the events will occur is given by the sum of the probabilities of all the individual events
Now, we just need to calculate P(X=20):
P(X=20) = (20 choose 20) * 0.91^20 * (1-0.91)^(20-20)
P(X=20) = 0.0919
So the probability that Steph Curry shoots exactly 20 free throws (including the one he misses) is approximately 0.0919, or 9.19%.
We are given that Steph Curry is a 91% free-throw shooter, which means he has a 91% chance of making each free throw and a 9% chance of missing one. We want to find the probability that he shoots exactly 20 free throws, including the one he misses.
probability that at least one of the events will occur is given by the sum of the probabilities of all the individual events
In uniform probability distributions, the likelihood of each possible outcome happening or not is the same. This property means that, for any given trial, the probability that an event will be successful does not change
Step 1: Calculate the probability of making the first 19 free throws. Since each free throw has a 91% chance of success, the probability is 0.91^19.
Step 2: Calculate the probability of missing the 20th free throw. This is a 9% chance or 0.09.
Step 3: Multiply the probability of making the first 19 free throws by the probability of missing the 20th one to find the overall probability. This is (0.91^19) * 0.09.
The probability that Steph Curry shoots exactly 20 free throws, including the one he misses, is approximately 0.0357 or 3.57%.
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Please journalize following items,
Now, journalize the usage of direct materials, including the related variance. (Prepare a single compound journal entry.)
Journalize the incurrance and assignment of direct labor costs, including the related variances. (Prepare a single compound journal entry.)
Journalize the entry to show the actual manufacturing overhead costs incurred.
Record the overhead allocated to Work-in-Process Inventory.
Journalize the movement of all production from Work-in-Process Inventory.
Record the entry to transfer the cost of sales at standard cost.
Journalize the adjusting of the Manufacturing Overhead account.(Prepare a single compound journal entry.)
Here are the journal entries for each scenario: (1) Usage of direct materials, including related variance (compound entry): Debit: Work-in-Process Inventory (standard cost).
Debit: Material Price Variance (difference), Credit: Raw Materials Inventory (actual cost), (2). Incurrance and assignment of direct labor costs, including related variances (compound entry): Debit: Work-in-Process Inventory (standard cost), Debit: Labor Rate Variance (difference)
Credit: Salaries and Wages Payable (actual cost)
3. Actual manufacturing overhead costs incurred: Debit: Manufacturing Overhead
Credit: Various Overhead Accounts (utilities, depreciation, etc.)
4. Overhead allocated to Work-in-Process Inventory:
Debit: Work-in-Process Inventory
Credit: Manufacturing Overhead
5. Movement of all production from Work-in-Process Inventory:
Debit: Finished Goods Inventory (standard cost)
Credit: Work-in-Process Inventory (standard cost)
6. Transfer the cost of sales at standard cost:
Debit: Cost of Goods Sold (standard cost)
Credit: Finished Goods Inventory (standard cost)
7. Adjusting the Manufacturing Overhead account (compound entry):
Debit: Manufacturing Overhead (over- or under-applied amount)
Debit/Credit: Cost of Goods Sold or Work-in-Process Inventory (depending on the disposition decision), Please note that these are generic entries and the exact amounts should be filled in based on your specific data.
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Mitchell bought 600 shares of Centerco two years ago for $34.50 per share. He sold them yesterday for $38.64 per share.
a. What was the percent increase in the price per share?
(Round to the nearest tenth of a percent.)
b. What was the total purchase price for the 600 shares?
c. What was the total selling price for the 600 shares?
d. What was the percent capital gain for the 600 shares?
(Round to the nearest tenth of a percent.)
e. How does the percent increase in the price of one share compare to the percent capital gain for all 600 shares?
Answer:
Total purchase price = 600 * 34.50 Total purchase price = $20,700 c. To find the total selling price for the 600 shares, we can multiply the number of shares by the final price per share. Total selling price = 600 * 38.64 Total selling price = $23,184 d.
2
The owner of a bookstore buys used books from customers for $1.50 each. The owner ther
resells the used books for 400% of the amount he paid for them.
What is the price of a used book in this bookstore?
F $5.50
G $4.00
H $2.10
J $6.00
Riutipica
Mashup
Answer:
The owner buys used books for $1.50 each and resells them for 400% of what he paid for them, which is the same as saying he multiplies the purchase price by 4.
So, the selling price of each used book is:
4 x $1.50 = $6.00
Therefore, the price of a used book in this bookstore is $6.00.
The answer is (J) $6.00.
have a good day and stay safe
Answer:
J 6.00
Step-by-step explanation:
1.50*400% which is equal to 1.50*4 which in turn is equal to $6.00.
I hope you liked my explanation
At a concession stand, five hot dogs and four hamburgers cost 13.25; four hot dogs and five hamburgers cost 13.75. Find the cost of one hot dog and the cost of one hamburger.
Okay, let's break this down step-by-step:
* 5 hot dogs and 4 hamburgers cost 13.25 total
* 4 hot dogs and 5 hamburgers cost 13.75 total
* So the difference between the two options is 0.5 (13.75 - 13.25 = 0.5)
* We have 9 items total in the first option and 9 items total in the second option
* So the difference of 0.5 must be due to the cost difference of either 1 hot dog or 1 hamburger
* Let's assume 1 hot dog costs x dollars
* Then, 5 hot dogs would cost 5x
* And 4 hot dogs would cost 4x
* So 5x + 4x = 13.25
* 9x = 13.25
* x = 1.5 (cost of 1 hot dog)
*
* Now let's look at the second option:
* 4 hot dogs would cost 4x = 4 * 1.5 = 6
* 5 hamburgers would cost y dollars each
* So 4x + 5y = 13.75
* 6 + 5y = 13.75
* 5y = 7.75
* y = 1.55 (cost of 1 hamburger)
So in summary:
The cost of one hot dog is $1.50
The cost of one hamburger is $1.55
Let me know if you have any other questions!
suppose f is continuous on [1,12] and differentiable on (1,12). if 11≤f′(x)≤13 for all values of x∈(1,12), what is the range of possible values of f(12)−f(1)?
The range of possible values for f(12) - f(1) is [110, 156].
How to find the range of possible values of f(12)−f(1)?For the range of possible values for f(12) - f(1),using the Mean Value Theorem, we know that there exists a c in (1,12) such that:
f(12) - f(1) = (12 - 1) f'(c)
Since we know that 11 ≤ f'(x) ≤ 13 for all x in (1,12), we can use these bounds to find the range of possible values for f(12) - f(1):
11 ≤ f'(c) ≤ 13
11(12-1) ≤ (12-1)f'(c) ≤ 13(12-1)
110 ≤ f(12) - f(1) ≤ 156
Therefore, the range of possible values for f(12) - f(1) is [110, 156].
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Determine the critical value, zo. to test the claim about the population proportion p > 0.015 given n-150 and p A) 2.33 0.027. Used, 0.01. B) 1.645 C) 2.575 D) 1.96
The critical value (zo) for the given test is 2.33. So, option A) is correct.
A critical value is the value of the test statistic which defines the upper and lower bounds of a confidence interval or defines the threshold of statistical significance in a statistical test.
Critical value can be defined as a value that is useful in checking whether the null hypothesis can be rejected or not by comparing it with the test statistic.
Based on the information provided, we can use a one-tailed z-test with a level of significance (α) of 0.01.
The formula for the critical value (zo) is:
zo = zα
where zα is the z-score corresponding to the level of significance (α).
Using a standard normal distribution table or calculator, we can find that the z-score for α = 0.01 is 2.33.
Therefore, the critical value (zo) for this test is 2.33.
Thus, option A) is correct.
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what is the probability that exactly one of the four scoops is vanilla flavored?
Answer:
probably about 10.24%
Step-by-step explanation:
determine whether the series is convergent or divergent. [infinity] n8 n9 3 n = 1
The series you're referring to is the sum from n=1 to infinity of (n⁸)/(3n⁹). To determine if it is convergent or divergent, we can use the Ratio Test.
Step 1: Compute the ratio of consecutive terms: (a_(n+1))/a_n = ((n+1)⁸)/(3(n+1)⁹) * (3n⁹)/(n⁸).
Step 2: Simplify the ratio: ((n+1)⁸)/(3(n+1)⁹) * (3n⁹)/(n⁸) = (n+1)⁸/(n+1)⁹ * (n⁹)/(n⁸) = 1/((n+1)(n)).
Step 3: Take the limit as n approaches infinity: lim (n→∞) 1/((n+1)(n)) = 0.
Since the limit is less than 1, the series converges by the Ratio Test.
In summary, the series ∑(n=1 to ∞) (n⁸)/(3n⁹) is convergent. The Ratio Test is used to determine this, by finding the limit of the ratio of consecutive terms, which is less than 1.
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exercise 1.1.7. solve dydx=1y 1 for .
The solution to dy/dx=1y is y=eˣ+C, where C is a constant.
This is found by separating the variables, integrating both sides, and solving for y. The constant C is determined by initial conditions or additional information about the problem.
This differential equation is a first-order linear homogeneous equation, meaning it can be solved using separation of variables. The solution shows that the rate of change of y is proportional to y itself, leading to exponential growth or decay depending on the sign of C.
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complete question:
The solution to differential equation dy/dx=1y is ?
Suppose a math class contains 35 students, 21 females (two of whom speak French) and 14 males (six of whom speak French). Compute the probability that a randomly selected student speaks French, given that the
student is female.
_________
The probability that a randomly selected student speaks French, given that the student is female, is 3/20.
How to Compute the probability that a randomly selected student speaks French, given that the student is female.The probability that a randomly selected student speaks French given that the student is female can be found using Bayes' theorem.
Let F be the event that a student speaks French, and let G be the event that a student is female. Then, we want to find P(F | G), the probability that a student speaks French given that the student is female.
We know that P(F) is the overall probability that a student speaks French, regardless of gender. This can be computed using the total number of French-speaking students divided by the total number of students:
P(F) = (2 + 6) / 35 = 8 / 35
We also know that P(G) is the overall probability that a student is female. This can be computed using the total number of female students divided by the total number of students:
P(G) = 21 / 35 = 3 / 5
Finally, we need to find P(G | F), the probability that a student is female given that the student speaks French. This can be computed using the formula for conditional probability:
P(G | F) = P(F | G) * P(G) / P(F)
We are given that six of the French-speaking students are male, so the remaining two must be female. Therefore, P(F | G) = 2 / 21. Substituting in the values we have computed, we get:
P(G | F) = (2 / 21) * (3 / 5) / (8 / 35) = 3 / 20
Therefore, the probability that a randomly selected student speaks French, given that the student is female, is 3/20.
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find the center of mass of the given system of point masses. (x, y) = mi 8 1 4 (xi, yi) (−7, −3) (0, 0) (−1, 6)
Center of mass of the given system of point masses is (-5, 1).
How to find the center of mass?We need to find the coordinates (x, y), where:
x = (m1x1 + m2x2 + m3x3) / (m1 + m2 + m3)
y = (m1y1 + m2y2 + m3y3) / (m1 + m2 + m3)
Here, we have three point masses with coordinates (x1, y1) = (-7, -3), (x2, y2) = (0, 0), and (x3, y3) = (-1, 6), and masses m1 = 8, m2 = 1, and m3 = 4.
Plugging in the values, we get:
x = (8(-7) + 1(0) + 4(-1)) / (8 + 1 + 4) = -5
y = (8(-3) + 1(0) + 4(6)) / (8 + 1 + 4) = 1
Therefore, the center of mass of the given system of point masses is (-5, 1).To find the center of mass, we need to find the coordinates (x, y), where:
x = (m1x1 + m2x2 + m3x3) / (m1 + m2 + m3)
y = (m1y1 + m2y2 + m3y3) / (m1 + m2 + m3)
Here, we have three point masses with coordinates (x1, y1) = (-7, -3), (x2, y2) = (0, 0), and (x3, y3) = (-1, 6), and masses m1 = 8, m2 = 1, and m3 = 4.
Plugging in the values, we get:
x = (8(-7) + 1(0) + 4(-1)) / (8 + 1 + 4) = -5
y = (8(-3) + 1(0) + 4(6)) / (8 + 1 + 4) = 1
Therefore, the center of mass of the given system of point masses is (-5, 1).
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X is a uniform random variable with parameters 0 and 1.Find a function g(x) such that the PDF of Y = g(x) is fY(y) = 3y^2 0<= y <=1,0 otherwise
The function g(x) that satisfies the given PDF of Y is g(x) = Y = 3x².
To find the function g(x), we need to use the transformation method. We know that Y = g(X), so we can use the following formula:
fY(y) = fX(x) * |dx/dy|
where fX(x) is the PDF of X, and |dx/dy| is the absolute value of the derivative of g(x) with respect to y.
In this case, X is a uniform random variable with parameters 0 and 1, so its PDF is:
fX(x) = 1 for 0 <= x <= 1, 0 otherwise.
Now we need to find g(x) such that fY(y) = 3y² for 0 <= y <= 1, 0 otherwise. Let's set g(x) = Y = 3x².
Then, we can find the derivative of g(x) with respect to y:
dy/dx = 6x
|dx/dy| = 1/|dy/dx| = 1/6x
Now we can substitute fX(x) and |dx/dy| into the formula:
fY(y) = fX(x) * |dx/dy|
fY(y) = 1 * 1/6x
fY(y) = 1/6(√y)
We can see that this matches the desired PDF of Y, which is 3y² for 0 <= y <= 1, 0 otherwise.
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what is the profitability index (pi) of a project with an initial investment of $194,000 and a net present value of –$68,000?
The profitability index for this project is approximately 0.65, indicating that it may not be a favorable investment as the PI is less than 1.
The profitability index (PI) is a ratio that measures the present value of future cash flows of a project per dollar of initial investment.
To calculate the PI of a project with an initial investment of $194,000 and a net present value of -$68,000, you would divide the present value of future cash flows by the initial investment.
PI = Present Value of Future Cash Flows / Initial Investment
Since the net present value is negative, we can assume that the present value of future cash flows is less than the initial investment.
PI = (-$68,000) / $194,000
PI = -0.35
The PI of the project is negative (-0.35), which means that the project is not expected to be profitable and may result in a net loss. Therefore, it may not be a wise investment decision.
The profitability index (PI) is a financial metric used to evaluate the attractiveness of an investment. It is calculated by dividing the present value of future cash flows by the initial investment. In this case, the initial investment is $194,000 and the net present value (NPV) is -$68,000. To calculate the PI:
PI = (NPV + Initial Investment) / Initial Investment
PI = (-$68,000 + $194,000) / $194,000
PI = $126,000 / $194,000
PI ≈ 0.65
The profitability index for this project is approximately 0.65, indicating that it may not be a favorable investment as the PI is less than 1.
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Based on years of weather data, the expected low temperature T (in degrees F) in Fairbanks, Alaska, can be approximated by T=36 sin [2pi/365(t-101)]+14, where t is in days and t=0 corresponds to January 1. Predict when the coldest day of the year will occur.
Therefore, the coldest day of the year in Fairbanks, Alaska, based on this model, is predicted to occur on October 11 (since t=0 corresponds to January 1, the 283rd day of the year is October 11).
To find the coldest day of the year, we need to find the minimum value of the function T, which represents the expected low temperature in Fairbanks, Alaska.
We can start by finding the derivative of the function with respect to t:
[tex]d(T)/dt = 36 * cos[2\pi/365(t-101)] * 2\pi/365[/tex]
Setting this derivative equal to zero and solving for t will give us the values of t that correspond to the minimum and maximum temperatures.
[tex]0 = 36 * cos[2\pi/365(t-101)] * 2\pi/365[/tex]
[tex]cos[2\pi /365(t-101)] = 0[/tex]
[tex]2pi/365(t-101) = pi/2 + n*\pi[/tex], where n is an integer.
[tex]t-101 = 182.5 + 365n[/tex]
[tex]t = 283.5 + 365n[/tex]
This equation gives us the values of t that correspond to the days when the minimum and maximum temperatures occur. We can see that the smallest value of t is obtained when n=0, which gives:
[tex]t = 283.5[/tex]
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What are the coordinates of Point A in the final image?
Rotate the triangle 90° clockwise
about the origin, then translate
it right 2 units and down 1 unit.
The final coordinates after the given transformation is: A"'(-1, 2)
What are the coordinates after transformation?The coordinates of the triangle before transformation are:
A(-3, 1), B(3, 2) and C(1, -4)
Now, to rotate triangle ABC about the origin 90° clockwise we would follow the rule (x,y) → (y,-x),
Thus, we have:
A'(1, 3)
It is translated 2 units to the right and so we have:
A"(1 - 2, 3)
= A"(-1, 3)
Now it is moved by 1 unit downward and so we have:
A"'(-1, 3 - 1)
= A"'(-1, 2)
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The final coordinates after the given transformation is: A"'(-1, 2)
What are the coordinates after transformation?The coordinates of the triangle before transformation are:
A(-3, 1), B(3, 2) and C(1, -4)
Now, to rotate triangle ABC about the origin 90° clockwise we would follow the rule (x,y) → (y,-x),
Thus, we have:
A'(1, 3)
It is translated 2 units to the right and so we have:
A"(1 - 2, 3)
= A"(-1, 3)
Now it is moved by 1 unit downward and so we have:
A"'(-1, 3 - 1)
= A"'(-1, 2)
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f(x) = 3x²-5x+4
find f(-9)
Step-by-step explanation:
put in -9 where 'x' is and compute
f(-9) = 3 ( -9)^2 -5 ( -9) + 4
= 3 (81) + 45 + 4
= 292
[tex]\sf f(-9) = 292.[/tex]
Step-by-step explanation:1. Write the fuction substituting "x" by "-9".[tex]\sf f(-9) = 3(-9)^{2} -5(-9)+4[/tex]
2. Solve the exponent.[tex]\sf f(-9) = 3(-9*-9) -5(-9)+4\\ \\f(-9) = 3(81) -5(-9)+4[/tex]
3. Solve all multiplications.[tex]\sf f(-9) = 243 -(-45)+4\\ \\f(-9) = 243+45+4[/tex]
4. Solve additions.[tex]\sf f(-9) = 292.[/tex]
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Write a quadratic function in standard form whose graph passes through (−6,0) (−4,0) and (−3,−18)
The quadratic function in standard form that passes through the points (-6,0), (-4,0), and (-3,-18) is f(x) = -2x^2 + 4x + 4.
To write the quadratic function in standard form, we can use the fact that a quadratic function can be expressed as
f(x) = a(x - h)² + k,
where (h, k) is the vertex of the parabola and "a" is a constant that determines the shape of the parabola.
Since the graph passes through (-6, 0), (-4, 0), and (-3, -18), we can set up three equations based on these points and solve for the unknowns a, h, and k.
First, using the point (-6, 0), we get
0 = a(-6 - h)² + k
Expanding the square and simplifying, we get
36a + ah² + k = 0 ----(1)
Similarly, using the point (-4, 0), we get
0 = a(-4 - h)² + k
Expanding and simplifying, we get
16a + ah² + k = 0 ----(2)
Using the point (-3, -18), we get
-18 = a(-3 - h)² + k
Expanding and simplifying, we get
9a + 6ah + ah² + k = -18 ----(3)
We now have three equations with three unknowns (a, h, k). We can solve them simultaneously to get the values of a, h, and k.
Subtracting equation (1) from (2), we get
20a = -4ah²
Dividing by -4a, we get
-5 = h²
Taking the square root of both sides, we get
h = ±√5 i
Since "h" is a real number, we must have h = 0.
Substituting h = 0 in equations (1) and (2), we get
36a + k = 0 ----(4)
16a + k = 0 ----(5)
Subtracting equation (4) from (5), we get
20a = 0
Therefore, a = 0.
Substituting a = 0 in equation (4), we get
k = 0.
Thus, the quadratic function is
f(x) = 0(x - 0)² + 0
Simplifying, we get
f(x) = 0
Therefore, the graph is a horizontal line passing through the x-axis at x = -6, -4, and -3.
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Let X1,X2, . . . ,Xn be a random sample from
N(μ, σ2), where the mean θ = μ is such that −[infinity] <
θ < [infinity] and σ2 is a known positive number. Show that
the maximum likelihood estimator for θ is6θ = X.
The maximum likelihood estimator for θ is 6θ = 6(X/n).
To find the maximum likelihood estimator for θ, we need to find the likelihood function first.
The likelihood function is given by:
L(θ | x) = f(x1, x2, . . . , xn | θ)
where f is the probability density function of the normal distribution with mean θ and variance σ2.
Using the density function of normal distribution, we get:
L(θ | x) = (2πσ2)^(-n/2) * exp(-(1/2σ2) * ∑(xi-θ)^2)
To find the maximum likelihood estimator, we need to maximize this likelihood function with respect to θ.
Taking the derivative of the likelihood function with respect to θ and setting it to zero, we get:
d/dθ (L(θ | x)) = (1/σ2) * ∑(xi-θ) = 0
Solving for θ, we get:
θ = (1/n) * ∑xi = X/n
Therefore, the maximum likelihood estimator for θ is 6θ = 6(X/n).
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1. Determine whether the sequence is increasing, decreasing, or not monotonic. an = 4n(-3) a. increasing b. decreasing c. not monotonic 2. Is the sequence bounded? O bounded O not bounded
The following can be answered by the concept of Sequence.
1. The sequence is decreasing as n increases. So, the answer is (b) decreasing.
2. The sequence is not bounded.
1. To determine whether the sequence is increasing, decreasing, or not monotonic, let's first examine the formula: an = 4n(-3). Simplifying this gives us an = -12n. Since the coefficient of n is negative, the sequence is decreasing as n increases. So, the answer is (b) decreasing.
2. To determine if the sequence is bounded, we need to see if there are upper and lower limits to the sequence. In this case, the sequence continues to decrease as n increases without any limit.
Therefore, the sequence is not bounded.
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find the matrix a of the rotation about the y -axis through an angle of π2, counterclockwise as viewed from the positive y -axis. a= [ ] .
To find the matrix a of the rotation about the y-axis through an angle of π/2 counterclockwise as viewed from the positive y-axis, we can use the following formula:
a = [ cos(θ), 0, sin(θ) ] [ 0, 1, 0 ] [-sin(θ), 0, cos(θ) ] where θ is the angle of rotation.
In this case, θ = π/2, so we have: a = [ cos(π/2), 0, sin(π/2) ] [ 0, 1, 0 ] [-sin(π/2), 0, cos(π/2) ]
Simplifying this, we get: a = [ 0, 0, 1 ] [ 0, 1, 0 ] [-1, 0, 0 ]
Therefore, the matrix a of the rotation about the y-axis through an angle of π/2 counterclockwise as viewed from the positive y-axis is: a = [ 0, 0, 1 ] [ 0, 1, 0 ] [-1, 0, 0 ]
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Find the length of the missing side
Answer: 13, 3.43
Step-by-step explanation:
Pythagorean theorem is:
c²=a²+b²
c is always the hypotenuse, the side that is longest or the side opposite of the right angle
a and b are the other 2 sides (for this it doesn't matter which is which
1. c=x a=12 b=5
x²=12²+5² 12² means (12)(12)=144 (12, 2 times)
x²=144+25 simplify by adding the numbers
x²=169 to solve for x take the √ of both sides
√x²=√169
x=13
2. c=10.1 b=9.5 a=x
10.1²=9.5²+x²
102.01=90.25 +x² subtract 90.25 from both sides
11.76=x² take square root of both sides to solve for x
√x²=√11.76
x=3.43
Answer: 13, 3.43
Step-by-step explanation:
Pythagorean theorem is:
c²=a²+b²
c is always the hypotenuse, the side that is longest or the side opposite of the right angle
a and b are the other 2 sides (for this it doesn't matter which is which
1. c=x a=12 b=5
x²=12²+5² 12² means (12)(12)=144 (12, 2 times)
x²=144+25 simplify by adding the numbers
x²=169 to solve for x take the √ of both sides
√x²=√169
x=13
2. c=10.1 b=9.5 a=x
10.1²=9.5²+x²
102.01=90.25 +x² subtract 90.25 from both sides
11.76=x² take square root of both sides to solve for x
√x²=√11.76
x=3.43
Pls help (part 1)
Find the volume!
Give step by step explanation!
The requried volume of the triangular prism with the cylindrical hole is 2808 cm³.
The volume of the triangular prism without cylindrical whole is given as:
Volume = Area of triangular face * length of the prism
Volume = 25 * [1/2*15*20]
Volume = 3750 cm³
The volume of the cylindrical holes:
Volume = πr²h
= 3.14*[4/2]²*25 = 314 cm³
Now, the volume of the triangular prism with the cylindrical hole is,
Volume = 3750 - 3 * 314
= 2808 cm³
Thus, the requried volume of the triangular prism with the cylindrical hole is 2808 cm³.
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