Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation 0.72.
(a) Compute a 95% CI for the true average porosity of a certain seam if the average porosity for 23 specimens from the seam was 4.85. (Round your answers to two decimal places.)
(b) Compute a 98% CI for true average porosity of another seam based on 14 specimens with a sample average porosity of 4.56. (Round your answers to two decimal places.)
(c) How large a sample size is necessary if the width of the 95% interval is to be 0.42? (Round your answer up to the nearest whole number.)
(d) What sample size is necessary to estimate true average porosity to within 0.24 with 99% confidence? (Round your answer up to the nearest whole number.)
Answers
For the normal distribution of helium porosity (in percentage) of coal samples,
a) 95% CI for the true average porosity of a certain seam is equals to ( 4.56 , 5.14 ).
b) A 98% CI for true average porosity of another seam based on 14 specimens is equals to (4.11 , 5.01).
c) Sample size with width of confidence interval 0.42 is 45.
d) Necessary Sample size to estimate true average porosity to within 0.24 is 60.
We have Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed.
Standard deviations, σ = 0.72
a)Average porosity of specimens , X-bar = 4.85
Sample size, n = 23
Confidence level , alpha = 95% = 0.95
From Normal Distribution table
Z for 95% Confidence Interval = 1.96
so,95% Confidence interval = (x-bar - Z× σ/sqrt(n) , x-bar + Z×σ/sqrt(n) )
plugging all known values in above formula,
= ( 4.85-1.96×0.72/sqrt(23) , 4.85+1.96×0.72/sqrt(23) )
So, 95% Confidence interval = ( 4.56 , 5.14 )
b)Now, Sample size, n = 14
sample mean, X-bar = 4.56
from normal distribution Z- table
Z-score for 98% CI is equal to 2.33
so,98% CI = (x-bar-Z×σ/sqrt(n) , x-bar+Z×σ/sqrt(n) )
= ( 4.56-2.33×0.72/√14 , 4.56+2.33×0.72/√14 )
98% CI = ( 4.11 , 5.01 )
c)Using the normal Distribution Z- table
Z for 95% CI = 1.96
Width of confidence interval = 0.42
we have to determine the sample size, n .
Using formula, Width = 2×Z×σ/sqrt(n)
=> n = (2×Z×sd/width)²
=> n= (2×1.96×0.72/0.42)²
=> n = 45.15
=> n = 45 ( whole number)
d) From normal distribution table
Z for 99% CI = 2.58
Margin of error, ME = 0.24
margin of error = ME = Z×σ/sqrt(n)
=> n = (Z× σ/ME)²
=> n= (2.58×0.72/0.24)²
=> n = 59.9
=> n = 60
Hence, required sample size is 60.
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Related Questions
Let S represent the number of randomly selected adults in a community surveyed to find someone with a certain genetic trait.The random variable S follows a geometric distribution with mean 4.66. Which of the following is a correct interpretation of the mean?answer choicesA value randomly selected from the distribution of S is expected to be 4.66.In repeated sampling from the distribution of S, the average of the values will approach 4.66.For a sample of values randomly selected from the distribution of S, the average of the sample will be 4.66.The probability is 0.66 that a value randomly selected from the distribution of S will be close to the mean.For a sample of values randomly selected from the distribution of S, the average of the sample will vary from the population mean by no more than 4.66.
Answers
Step-by-step explanation:
correct interpretation of the mean?answer choicesA value randomly selected from the distribution of S is expected to be 4.66.In repeated sampling from the distribution of S, the average of the values will approach 4.66.For
Aaliyah invests $7,000.00 at 4% simple interest for 1103 days.
How much interest is earned over the 1103 day period?
The interest earned over the 1103 day period is _______
How much is in the account at the end of the 1103 day period?
Aaliyah will have __________
in the account at the end of the 1103 day period.
Answers
The interest earned over the 1103 day period is $840
Aaliyah will have $7840 in the account at the end of the 1103 day period.
What is simple interest?Simple interest is defined as the amount of money that is paid to an individual following an investment that is made to an account.
The amount of money invested = $7,000.00
The rate of interest= 4%
The time of investment = 1103 = 3 years
Simple interest = P×T×R/100
= 7000×4×3/100
= 84000/100
= $840
The amount of money that is in the account at the end of the 1103 day period = 7000 + 840 = $7,840
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There are 99 males and 121 females participating in a marathon. What percent of the participants are female?
Enter your answer in the box.
_____%
Answers
99 males + 121 females = 220 participants
121/220 are female
121 divided by 220 = 0.55
0.55 x 100 = 55%
Y is the midpoint of XZ and W is the midpoint of VX. If VZ = s + 14 and WY = s, what is the value of s?
Answers
Y is the midpoint of XZ and W is the midpoint of VX. If VZ = s + 14 and WY = s, the value of s is 14.
Define midpoint.The point that divides a line segment into two equal halves is known as the midway in geometry. A point that divides a line segment into two equal halves is the midpoint of the segment. In other words, the line segment's midpoint is precisely in the middle. The midpoint of a line segment is known as the midpoint in geometry. It is the centroid of the segment and of the ends, and it is equally distant from both of them. It cuts the section in half.
Given,
VZ = s + 14
WY = s
VZ bisects WY
VZ = 2WY
s + 14 = 2(s)
s + 14 = 2s
2s - s = 14
s = 14
Y is the midpoint of XZ and W is the midpoint of VX. If VZ = s + 14 and WY = s, the value of s is 14.
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Solve for m in the equation below. It may be helpful to convert the equation into exponential form. Write answer as an integer or reduced fraction. -2. log,(m) - 24 = - 20 m = > Next Question Find the largest value of 2 that satisfies: log, () – log (2 + 1) = 9 =
Answers
The largest possible value of 2 that satisfies the equation is approximately 1.1.
What is Exponential Form Equation?
Since y=bx, y = b x is a one-to-one inverse of the exponential function, x=by x = b y, it too is a function. We simply swap x and y and solve for y to discover the inverse function, as is the case with all inverse functions.
To solve for m in the equation -2 * log(m) - 24 = -20, we can start by converting the equation into exponential form. To do this, we can raise both sides of the equation to the power of e:
[tex]e^(-2 * log(m) - 24) = e^(-20)[/tex]
Then we can simplify:
[tex]m^(-2) = e^(-20)[/tex]
Then we can solve for m:
[tex]m = sqrt[e^20]\\\\= sqrt[20*e^9]\\\\= sqrt[20] * sqrt[e^9]\\\\= 2 * 3^(1/2)= 2 * 1.732\\\\= 3.464[/tex]
So m is approximately equal to 3.464
To find the largest value of 2 that satisfies the equation [tex]log(2^2) - log(2 + 1) = 9[/tex], we can start by expanding the left-hand side of the equation:
[tex]log(2^2) - log(2 + 1) \\\\=log(2^2 / (2 + 1))\\\\ = log(4/3) = 9[/tex]
Then we can rewrite the equation as:
log(4/3) = 9
Then we can solve for 2:
[tex]2 = (4/3)^(1/9)\\\\= (4^(1/9)) / 3^(1/9)\\\\= 1.5874010519681994 / 1.4422495703074083\\\\= 1.1[/tex]
So, The largest possible value of 2 that satisfies the equation is approximately 1.1.
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The art museum is 8 1/2 miles from Alison's house. Alison has ridden her bike 2/3 of the way there so far. How far has she gone?
Answers
Alison has traveled six miles on her bike.
What is the distance?Distance is defined as the product of speed and time.
To find how far Alison has ridden her bike, we need to first convert 8 1/2 miles to miles as a mixed number.
We can do this by multiplying the fractional part of the mixed number by the denominator of the fraction:
8 1/2 miles = 8 miles + (1/2 x 2) miles = 8 miles + 1 mile = 9 miles
We can now multiply this distance by 2/3 to find how far Alison has ridden her bike:
9 miles x 2/3 = 6 miles
Therefore, she has ridden her bike 6 miles.
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O For a period of time, an island's
population grows exponentially. If the
continuous growth rate is 3% per year and
the current population is 1,767, what will
the population be 10 years from now?
0.03 - 10
≈2,385
5,867
A) 1767e
3) 1767e0.12.
C) 442e0.03-10
D) 1767e0.09
10
≈
≈597
0.09 - 10
≈4,346
valuate each expression
Answers
The population of the island after 10 years will be approximately 2385.
What is the formula for exponential growth and exponential decaying function?The formula for exponential growth is [tex]y = y_0e^{(kt)}.[/tex]
The formula for exponential decay is [tex]y = y_0e^{(-kt)}[/tex].
Increases in a population's or a dispersed group's membership are referred to as population growth. The actual annual increase in the human population is about 83 million, or 1.1%.
Given, an island's population grows exponentially and the continuous growth rate is 3% per year and the current population is 1,767.
∴ The population be 10 years from now will be,
[tex]y_{10} = y_0e^{(0.03)\times10}[/tex].
We have written 3% as a decimal and it is the correct way of putting it into the formula for exponential growth or decaying equations.
[tex]y_{10} = 1767e^{0.3}[/tex].
[tex]y_{10} = 1767\times1.35[/tex].
[tex]y_{10} = 2385[/tex].
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Find the average rate of change of g (x)=-2x³ +5x² from x=2 to x = 3.
Simplify your answer as much as possible.
Answers
The average rate of change of g (x)=-2x³ +5x² from x=2 to x = 3 is
a(x)= -13
What is meant by average rate of change?It represents the average change in the function's per-unit value during that time period. On the function's graph, it is generated from the slope of the line connecting the interval's ends. Following is the formula for the average rate of change:
a(x) = [f(b) - f(a)]/(b - a)
where,
a(x) = Average Rate of Change
f(a) = Function Value at a
f(b) = Function Value at b
Given,
g (x)=-2x³ +5x² from x=2 to x = 3
Average rate of change is a(x)
g (x)=-2x³ +5x²
Put x=2 in the above equation
g(2)= -2(2)³+5(2)²
= -16+20
=4
g(2)=4
Now, put x=3 in the above equation
g(3)= -2(3)³+5(3)²
= -57+45
= -9
We know that,
Average rate of change a(x)= (g(b)-g(a))/(b-a)
a(x)= g(3)-g(2)/(3-2)
a(x)= (-9-4)/1
a(x)= -13
Therefore, the average rate of change a(x)= -13
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determine whether the improper integral diverges or converges. evaluate the integral if it converges. 14/(x-8^2
Answers
Therefore ,the answer of this integration problem comes out to be 4/9.
Integrity, what is it?To describe notions like displacement, area, volume, and other results of the combination of incredibly small inputs, an integral in mathematics imparts numerical values to functions. Integration is a method used in the process of integral discovery.
Here,
Given :
=> [tex]\int\limits^9_7 {\frac{14}{(x-8)^{2} } } \, dx[/tex]
=> substitute x- 8 =u
=>du/dt =d(x-8)/dx = 1
=>du/dt =1
=> [tex]\int\limits^9_7 14{\frac{1}{(x-8)^{2} } } \, dx[/tex]
Substituting x- 8 =u
=> [tex]\int\limits^9_7 14{\frac{1}{(u)^{2} } } \, dx[/tex]
=> 14 [ [tex]\left \{ {{9} \atop {7}} \right. (\frac{-1}{u} )[/tex] ]
=> 14( -1/9) + 1/7)
=> 14 ( ( 9 -7 ) / 63 )
=> 14 (2/63)
=> 28/63
=>4/9
Therefore ,the answer of this integration problem comes out to be 4/9.
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Algebraically prove that x^3 + 9 / x^3+8 = 1 + 1/x^3 +8 , where x ≠ -2
Answers
Using the income statement below, calculate the following profitability ratios for Western Bookkeeping and Tax Service. Assume that stockholder's equity equals $441,600 and total assets equal $640,000.
Profit margin ratio
Return on equity ratio
Asset turnover ratio
Write the profit margin and return on equity ratios as a percent, rounded to the nearest percent. Write the asset turnover ratio as a decimal, rounded to two decimal places.
Answers
The computation of the profitability ratios for Western Bookkeeping and Tax Service is as follows:
Profit margin ratio = 8%Return on equity ratio = 8%Asset turnover ratio = 0.75.What are profitability ratios?Profitability ratios are the financial ratios that evaluate an entity's ability to convert its earnings (revenue) into profit versus different criteria.
Some of the common profitability ratios include:
Gross Profit MarginOperating Income RatioNet Income RatioReturn on Investment (ROI)Return on EquityReturn on Total AssetsAsset turnover RatioEarnings per share.Stockholders' equity = $442,600
Total assets = $640,000
Net sales = $480,000
Net income = $36,000
Profit margin ratio = Net income/Net Sales x 100
= $36,000/$480,000 x 100
= 7.5%
= 8%
Return on equity ratio = Net income/Shareholders' Equity x 100
= $36,000/$442,600 x 100
= 8.13%
= 8%
Asset turnover ratio = Net Sales/Total Assets
= $480,000/$640,000
= 0.75
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Eileen is making lemonade with water and lemon concentrate. What percent of each mixture is
lemon concentrate?
a. The ratio of water to lemon concentrate is 3 to 1.
b. Eileen mixes 4 parts water for each part of lemon concentrate.
c. 4 out of every 5 cups of the mixture is water.
Answers
a) The percentage of lemon is 25%
b) The percentage of lemon is 20%
c) The percentage of lemon is 20%
What is a percentage?The percentage is calculated by dividing the required value by the total value and multiplying by 100.
Example:
Required percentage value = a
total value = b
Percentage = a/b x 100
Example:
50% = 50/100 = 1/2
25% = 25/100 = 1/4
20% = 20/100 = 1/5
10% = 10/100 = 1/10
We have,
a)
Water : Lemon = 3 : 1
Percent of lemon concentrate:
= 1/4 x 100
= 25%
b)
1 part of lemon = 4 part of water
Percent of lemon.
= 1/5 x 100
= 20%
c)
Cups of lemon = 1
Cups of water = 4
Percent of lemon.
= 1/5 x 100
= 20%
Thus,
The percent of each answer is given above.
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on Monday Therease went to the doctor and got an antibiotic for strep throat. The doctor told her take a dose of 4.8 ml every 12 hours for 7 days. If Thereas took her first dose at 9:00 AM on Monday, what day and time should she take her 7th dose?
Answers
The day and time that Thereas should take her 7th dose, given that she should take the dose every 12 hours is 9 am on Thursday.
How to find the day to take the dose ?From the first day that Therease took the dose which was 9 am on Monday, the table to show the days and times she takes the other doses, based on her taking them every 12 hours is:
Day Time
First dose Monday 9 am
Second dose Monday 9 pm
Third dose Tuesday 9 am
Fourth dose Tuesday 9 pm
Fifth dose Wednesday 9 am
Sixth dose Wednesday 9 pm
Seventh dose Thursday 9 am
Therese will therefore take the seventh dose at 9 am on Thursday.
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The maximum weight, w, that an elevator can hold is 2200 pounds. Which inequality represents the situation?
Answers
Answer: w ≤ 2200 would represent the situation
Nine less than two times a number is five more than this number.
Answers
The statement as an expression is 2x - 9 = 5 + x
How to determine the statement as an expression?From the question, we have the following statement that can be used in our computation:
Nine less than two times a number is five more than this number.
Express the numbers properly
So, we have the following representation
9 less than 2 times a number is 5 more than this number.
Introduce the equality symbols
So, we have the following representation
9 less than 2 times a number = 5 greater than this number.
Next, we apply the mathematical operators
So, we have the following representation
2 times a number - 9 = 5 + number.
Express the number as x
So, we have
2x - 9 = 5 + x
Hence, the expression is 2x - 9 = 5 + x
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Write the complete proof in your paper homework and for online (only) complete the probing statement (if any) that is a part of your proof or related to it.
Given: BD ≅ BF
DE⊥BC
F K ⊥ AB
Prove: ED ≅ F K
Answers
The triangle ΔBHK and ΔBDE are congruent with each other. Then the side length ED is equal to the side length HK.
What is the triangle?The polygonal shape of a triangle has a number of sides and three independent variables. Angles in the triangle add up to 180 °.
Replace F with H.
The triangles ΔBHK and ΔBDE are shown.
In triangles ΔBHK and ΔBDE, then we have
BD ≅ BH (Given)
∠HBK = ∠DBE (Common angle)
∠BHK = ∠BDE = 90° (Right angle)
The triangle ΔBHK and ΔBDE are harmonious with one another. Then, at that point, the side length ED is equivalent to the side length HK.
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I NEED HELP ASAPPPPPP
Answers
Answer:
2.5
Step-by-step explanation:
m is the gradient
to find this we do the change in y/change in x
using the first 2 values we have been given:
change in y= 15-10
change in x= 4-2
5/2= 2.5
the gradient in 2.5
1/4+1/6 in fractions
Please help me I’m giving you 25 pints things
Answers
3+2/12
Answer: 5/12
Step by step:
1)Find the LCM of 6 and 4 =12
2)set both fractions to over 12 and do whatever you done to the bottom to the top
3)1x3=3 1x2=2
4)3+2 =5
Answer: 5/12
Drag the tiles to the boxes to form correct pairs. Not all tiles will be used.
Determine which statements are the converse, inverse, and contrapositive of the following statement.
If a figure is a square, it is a polygon.
Answers
Answer:
Step-by-step explanation:
A tortoise and a hare are competing in a 2000-meter race. The arrogant hare decides to let the tortoise have a 820-meter head start. When the start gun is fired the hare begins running at a constant speed of 7.5 meters per second and the tortoise begins crawling at a constant speed of 4.5 meters per second.
a. Write an expression in terms of t that represents the hare's distance from the starting line (in meters)
b. Write an expression in terms of t that represents the tortoise's distance from the starting line (in meters).
c. Write an expression in terms of t that represents the number of meters the tortoise is ahead of the hare.
Answers
a. The hare's distance from the starting line is represented by the expression 7.5t.
b. The tortoise's distance from the starting line is represented by the expression 4.5t+820.
c. The number of meters the tortoise is ahead of the hare is represented by the expression 4.5t+820-7.5t.
In the race, the hare is running at a constant speed of 7.5 meters per second, so their distance from the starting line is equal to their speed multiplied by the time it takes them to run that distance. This is represented by the expression 7.5t, where t is the time in seconds it takes the hare to run.
Similarly, the tortoise is crawling at a constant speed of 4.5 meters per second, so their distance from the starting line is equal to their speed multiplied by the time it takes them to crawl that distance, plus the 820-meter head start they were given. This is represented by the expression 4.5t+820, where t is the time in seconds it takes the tortoise to crawl.
To find the number of meters the tortoise is ahead of the hare, we subtract the hare's distance from the starting line from the tortoise's distance from the starting line, which gives us the expression 4.5t+820-7.5t.
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358.584 divided by 8.92 using mental math and the division algorithm
Answers
Answer:
Below
Step-by-step explanation:
358.584 is about 360 8.92 is about 9
360 / 9 = 40 approx by' doing it in your head '
ACTUAL answer = 358.584/8.92 = 40.2 Pretty darn close !
For g(x) = 12x - 2, evaluate g (1).
A. -1
B. 1
C. 2
D. -2
Answers
Answer:
B
Step-by-step explanation:
g(x) = 12x - 2
g(1/4) = 12(1/4) - 2 ==> plug in 1/4 for x
g(1/4) = 12 * 1/4 - 2
g(1/4) = 12/4 - 2
g(1/4) = 3 - 2
g(1/4) = 1 ==> B
Answer:
Step-by-step explanation:
To evaluate g(1) for the function g(x) = 12x - 2, you can substitute the value 1 for x in the function:
g(1) = 12(1) - 2
g(1) = 12 - 2
g(1) = 10
Therefore, g(1) = 10. B
PLEASE HELP IM TIMED I WILL GIVE BRAINLIST!!!!!!!!
Answers
The distance between the line segments PQ, RS and TV are √53 respectively
Distance Between Two PointsThe distance between any two points is the length of the line segment joining the points. There is only one line passing through two points. So, the distance between two points can be calculated by finding the length of this line segment connecting the two points.
The formula is given as;
d = √(x₂ - x₁)² + (y₂ - y₁)²
In the first line segment;
P = (0,4), Q = (7, 2)
d = √((7-0)² + (2 - 4)²)
d = √53
b)
R = (-7, 6), S = (-5, -1)
d = √((-1 - 6)² + (-5 --7)²)
d = √53
c)
T = (0, -8), V = (2, -1)
d = √((-1 --8)² + (2 - 0)²)
d = √53
The distance between the lines are all √53 units
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5. A person's weight varies directly with gravity. If a person weighs 180 pounds on Earth, they will weigh
only 30 pounds on the moon. If Haresh weighs 54 pounds on Earth, how much would he weigh on the
moon?
Answers
When Haresh weighs 54 pounds on Earth, his weigh on the moon will be 9 pounds.
How to calculate the value of the weight?From the information, person's weight varies directly with gravity. If a person weighs 180 pounds on Earth, they will weigh only 30 pounds on the moon.
The constant of proportionality will be:
= 180 / 30.
= 6..
Therefore, Haresh weighs 54 pounds on Earth, his weigh on the moon will be:
= 54 / 6
= 9 pounds.
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Graph by finding the x and y intercepts using a table
-3x-6y=0
Answers
Answer: see below
Step-by-step explanation:
x=0 -3(0)-6y=0 -6y=0 y=0
x=1 -3(1)-6y=0 -4-6y=0 -6y=4 y=4/6 or 2/3
x=2 -3(2)-6y=0 -6-6y=0 -6y=6 y=-1
x=3 -3(3)-6y=0 -9-6y=0 -6y=9 y= -9/6 or -3/2
x=-1 -3(-1)-6y=0 3-6y=0 -6y=-3 y=1/2
x y
-1 1/2
0 0
1 -2/3
2 -1
3 -1 1/2
You need a $12,000 loan to buy a good used car. Your bank offers a 3-year loan with an APR of 5% and a 5-year loan with an APR of 8%. Find the monthly payment and total interest paid for each loan option. Which would you choose? What is the better deal?
Answers
In case of APR 5% total payment made is $12,947.42 and in case of APR 8% total payment made is $14,598.94. Therefore the better deal to choose to pay the less payment is 1st case.
Define APR.APR is the annual interest produced by a sum that is paid to investors or charged to borrowers is referred to as the annual percentage rate (APR). This does not account for compounding and includes any fees or additional expenditures related to the transaction. Consumers can evaluate lenders, credit cards, or investment goods using the APR as a benchmark figure.
Initial payment is $12,000 with 5% APR and 3 year loan
Monthly payment = P[ i(1+i)ⁿ] / [(1+i)ⁿ-1]
= 12,000[0.05(1+0.05)³]/[1+0.05)³-1]
=$359.65
Over 36 payments total payment is $12,947.42
And in case of 8% APR with a 5 year loan
Monthly payment = 12,000[0.08(1+0/08)⁵] / [(1+0.08)⁵-1]
=$243.31
Over 60 payments total payment is $14,598.94
So, the best deal is 5% APR with a 3 year loan.
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Can someone help me with this question????
Answers
Answer:
[tex]P = \boxed{\sf 4000}[/tex]
[tex]r=\boxed{\sf 0.03}[/tex]
[tex]n=\boxed{\sf 4}[/tex]
[tex]t=\boxed{\sf 5}[/tex]
Step-by-step explanation:
[tex]\boxed{\begin{minipage}{8.5 cm}\underline{Compound Interest Formula}\\\\$ A=P\left(1+\frac{r}{n}\right)^{nt}$\\\\where:\\\\ \phantom{ww}$\bullet$ $A =$ final amount \\ \phantom{ww}$\bullet$ $P =$ principal amount \\ \phantom{ww}$\bullet$ $r =$ interest rate (in decimal form) \\ \phantom{ww}$\bullet$ $n =$ number of times interest is applied per year \\ \phantom{ww}$\bullet$ $t =$ time (in years) \\ \end{minipage}}[/tex]
If you invest $4,000 then the principal amount is $4,000. As P represents the principal amount:
[tex]\implies P = \boxed{\sf 4000}[/tex]
The interest is 3%. 3% = 3/100 = 0.03. Therefore:
[tex]\implies r=\boxed{\sf 0.03}[/tex]
"n" represents the number of times interest is applied per year.
Therefore, if the interest is applied quarterly then:
[tex]\implies n=\boxed{\sf 4}[/tex]
"t" represents the time in years. Therefore, if you plan to leave the money in the account for 5 years then:
[tex]\implies t=\boxed{\sf 5}[/tex]
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To calculate the amount in the account after 5 years, substitute the values into the formula and solve for A:
[tex]\implies A=4000\left(1+\dfrac{0.03}{4}\right)^{4 \times 5}[/tex]
[tex]\implies A=4000\left(1+0.0075\right)^{20}[/tex]
[tex]\implies A=4000\left(1.0075\right)^{20}[/tex]
[tex]\implies A=4000(1.16118414...)[/tex]
[tex]\implies A=\$4644.74[/tex]
Can someone do these 4 questions For 40 points
Answers
The gradient of the blue line as shown in the graph is 0.25
What is gradient?The gradient of any line or curve tells us the rate of change of one variable with respect to another.
To calculate the gradient of the blue line, we use the formula below.
Formula:
S = Δy/Δx = (y₂-y₁)/(x₂-x₁)................. Equation 1Where:
S = Gradient of the blue lineΔy = Change in y-axisΔx = Change in x-axisFrom the graph,
Given:
x₁ = 0y₁ = 1x₂ = 8y₂ = 3Substitute these values into equation 1
S = (3-1)/(8-0)S = 2/8S = 1/4S = 0.25Hence, the gradient of the blue line is 0.25.
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Twenty percent of U.S. adults have some type of mental illness. You randomly select 6 U.S. adults. Find the probability that the number of adults having some type of mental illness is:
a)exactly two
b)at least one
c)less than three
d)find the mean, variance, and standard deviation for this distribution
Answers
The mean is 1.2 ,variance is 0.96 and standard deviation of the given data is 96 square root.we can find all these data by using formula of probability.
what is probability?Probability means possibility.It is a branch that deals with occurrence of random event.The value is given in the probability from 0 to 1.Probability is how likely something is to happen.It is used in real life for analysis data.we can find probability to favorable outcomes divided by total outcomes.
What is difference between standard deviation and variation?Standard deviation measures how far apart numbers are in a data set.Variance gives us the actual value to how much the numbers in a data set vary from the mean.The variance is equal to the square standard deviation and standard deviation is the square root of the variance.
NOW we have data
Person(ill)=20% =0.20 n=6
For Exactly two p(x) =2
now we get 24.58% by using binomial theorem and putting value in the formula.
NOW for at least one p(x)>1 By putting value we get 0.7379.
Now for less than three p(x<30) we get 0.9011
Now to find mean
Mean=person (ill) multiply n
Mean = 0.20 * 6
Mean= 1.2
Variance= 1.2*0.80
=0.96
IN the last we find standard deviation.it will be 96 square root.
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A bus company took a tour bus on the ferry when there were 30 people aboard. The ferry charged the bus company $180. The following week, the bus had 50 people on board and the ferry charged them $220. How much is the "base rate" for the empty bus? hint: look at the difference between number of people and cost to get cost per person and then cost without people
How much does each person cost?
Write an equation to show cost, c, of a bus with x number of people on it
Answers
Answer:
Base rate: $120
Rate: $2 per person
Equation: f(x)=2x+120
Step-by-step explanation:
If 30 people cost $180 and 50 people cost $220, the charge for 20 extra people is $40. This means, [tex]\frac{220-180dollars}{50-30people}=\frac{40dollars}{20people}=2\frac{dollars}{person}[/tex].
These values correspond to a base rate for the bus of $120.
The function for the cost per bus with x number of people on it would be:
[tex]f(x)=2x+100[/tex]
This can be checked by using the values given in the problem:
[tex]f(30)=2(30)+120=180\\f(50)=2(50)+120=220[/tex]
The base rate of $120 and $2 per person satisfies the given equation and established values.