Answers
Answer: Valentina measured incorrectly.
Step-by-step explanation: 1 feet equals to 12 inches. If you substitute this value for all the other values like 5 ft and 8 inches (Noah's measurement). Firstly, 5 multiplied by 12 is 60, then you would add 8 to it. Caleb already measured the same amount of inches as Noah so we can just leave that one. Same with Mary, 3 * 12 inches = 36 plus 32 which is also 68. Finally, we are left with Valentina in which she has 2 * 12 inches =24 plus 48 which is 72, not 68. Hence, Valentina measured incorrectly.
Related Questions
Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.2.a. If the distribution is normal, what is the probability that the sample mean hardness for a random sample of 9 pins is at least 51?b. Without assuming population normality, what is the (approximate) probability that the sample mean hardness for a random sample of 40 pins is at least 51?
Answers
Answer:
a
[tex]P(\= X \ge 51 ) =0.0062[/tex]
b
[tex]P(\= X \ge 51 ) = 0[/tex]
Step-by-step explanation:
From the question we are told that
The mean value is [tex]\mu = 50[/tex]
The standard deviation is [tex]\sigma = 1.2[/tex]
Considering question a
The sample size is n = 9
Generally the standard error of the mean is mathematically represented as
[tex]\sigma_x = \frac{\sigma }{\sqrt{n} }[/tex]
=> [tex]\sigma_x = \frac{ 1.2 }{\sqrt{9} }[/tex]
=> [tex]\sigma_x = 0.4[/tex]
Generally the probability that the sample mean hardness for a random sample of 9 pins is at least 51 is mathematically represented as
[tex]P(\= X \ge 51 ) = P( \frac{\= X - \mu }{\sigma_{x}} \ge \frac{51 - 50 }{0.4 } )[/tex]
[tex]\frac{\= X -\mu}{\sigma } = Z (The \ standardized \ value\ of \ \= X )[/tex]
[tex]P(\= X \ge 51 ) = P( Z \ge 2.5 )[/tex]
=> [tex]P(\= X \ge 51 ) =1- P( Z < 2.5 )[/tex]
From the z table the area under the normal curve to the left corresponding to 2.5 is
[tex]P( Z < 2.5 ) = 0.99379[/tex]
=> [tex]P(\= X \ge 51 ) =1-0.99379[/tex]
=> [tex]P(\= X \ge 51 ) =0.0062[/tex]
Considering question b
The sample size is n = 40
Generally the standard error of the mean is mathematically represented as
[tex]\sigma_x = \frac{\sigma }{\sqrt{n} }[/tex]
=> [tex]\sigma_x = \frac{ 1.2 }{\sqrt{40} }[/tex]
=> [tex]\sigma_x = 0.1897[/tex]
Generally the (approximate) probability that the sample mean hardness for a random sample of 40 pins is at least 51 is mathematically represented as
[tex]P(\= X \ge 51 ) = P( \frac{\= X - \mu }{\sigma_x} \ge \frac{51 - 50 }{0.1897 } )[/tex]
=> [tex]P(\= X \ge 51 ) = P(Z \ge 5.2715 )[/tex]
=> [tex]P(\= X \ge 51 ) = 1- P(Z < 5.2715 )[/tex]
From the z table the area under the normal curve to the left corresponding to 5.2715 and
=> [tex]P(Z < 5.2715 ) = 1[/tex]
So
[tex]P(\= X \ge 51 ) = 1- 1[/tex]
=> [tex]P(\= X \ge 51 ) = 0[/tex]
Using the normal distribution and the central limit theorem, we have that there is a:
a) 0.0062 = 0.62% probability that the sample mean hardness for a random sample of 9 pins is at least 51.
b) 0% approximate probability that the sample mean hardness for a random sample of 40 pins is at least 51.
In a normal distribution with mean and standard deviation , the z-score of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
It measures how many standard deviations the measure is from the mean. After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X. By the Central Limit Theorem, the sampling distribution of sample means of size n has standard deviation [tex]s = \frac{\sigma}{\sqrt{n}}[/tex].In this problem:
Mean of 50, hence [tex]\mu = 50[/tex]Standard deviation of 1.2, hence [tex]\sigma = 1.2[/tex]Sample of 9, hence [tex]n = 9, s = \frac{1.2}{\sqrt{9}} = 0.4[/tex].Item a:
The probability is 1 subtracted by the p-value of Z when X = 51, hence:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
By the Central Limit Theorem
[tex]Z = \frac{X - \mu}{s}[/tex]
[tex]Z = \frac{51 - 50}{0.4}[/tex]
[tex]Z = 2.5[/tex]
[tex]Z = 2.5[/tex] has a p-value of 0.9938.
1 - 0.9938 = 0.0062
There is a 0.0062 = 0.62% probability that the sample mean hardness for a random sample of 9 pins is at least 51.
Item b:
Even though the distribution is not normal, the sample size is of [tex]n = 40 > 30[/tex], hence the Central Limit Theorem can be applied.
[tex]s = \frac{1.2}{\sqrt{40}} = 0.19[/tex]
[tex]Z = \frac{X - \mu}{s}[/tex]
[tex]Z = \frac{51 - 50}{0.19}[/tex]
[tex]Z = 5.26[/tex]
[tex]Z = 5.26[/tex] has a p-value of 1.
1 - 1 = 0
0% approximate probability that the sample mean hardness for a random sample of 40 pins is at least 51.
A similar problem is given at https://brainly.com/question/24663213
Multiply 3 over 7 times 5over 8
Answers
Answer:
0.26785714285
Step-by-step explanation:
Answer:
Step-by-step explanation:
3/7 * 5/8
This equates to 15/56.
Multiply 3 and 5 (which equals 15).
Multiply 7 and 8 (which equals to 56)
#teamtrees #WAP (Water And Plant)
Mr mogi barrowed $9,000 for 10 years to make home improvements if he paid a total of $11,000 in interest in interest at what I test rate did he barrow the money
Answers
Answer:
Step-by-step explanation:
Calculate the average rate of change from 3 to 9 seconds, in feet per second
Answers
Answer:
D is the Answeer
Step-by-step explanation:
Average rate of change from 3 to 9 seconds is -0.475 feet per second
What is Average rate of change?It is a measure of how much the function changed per unit, on average, over that interval
Given,
P(t) represents the height in feet and t represents the time in second
At t= 3 second, P(t) = 6.26 feet
At t=9 second, P(t) = 3.41 feet
Average rate of change = [tex]\frac{P(b)-P(a)}{b-a}[/tex]
Substitute the values in the equation
Average rate of change = [tex]\frac{P(9)-P(3)}{9-3}[/tex]
[tex]=\frac{3.41-6.26}{9-3}\\=\frac{-2.85}{6}\\[/tex]
= -0.475 feet per second
Hence, the Average rate of change from 3 to 9 seconds is -0.475 feet per second
Learn more about Average rate of change here
https://brainly.com/question/23715190
#SPJ2
Which figure is shown in the drawing?
Answers
ray XY is the answer
Please give Brainliest also I hope this helps!
In the figure, of the given alternatives, a ray XY is shown.
What is a ray?The definition of ray in math is that it is a part of a line that has a fixed starting point but no endpoint. It can extend infinitely in one direction.Given is the figure as shown in the image.
Of the given options, only a ray given by XY{with overhead arrow} can be seen as it has one starting point at [x] and extends along.
Therefore, in the figure, of the given alternatives, a ray XY is shown.
To solve more questions on geometry, visit the link below -
https://brainly.com/question/13254913
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Help!? Helping my son with geometry ... I have no clue what I’m doing here
Answers
We are Given:
∠1 = 65°
Finding the measure of all other angles with proof:∠2:
∠1 + ∠2 = 180° (angle 1 and 2 form a Linear Pair)
65 + ∠2 = 180 (Angle 1 = 65°)
∠2 = 180 - 65
∠2 = 115°
∠3:
∠1 = ∠3 (Angle 1 and 3 are vertically opposite)
65 = ∠3 (Angle 1 = 65°)
∠3 = 65°
∠4:
∠4 = ∠2 (Vertically opposite angles)
∠4 = 115° (∠2 = 115°)
∠5:
∠5 = ∠1 (Corresponding angles)
∠5 = 65° (∠1 = 65°)
∠6:
∠6 = ∠2 (Corresponding angles)
∠6 = 115° (∠2 = 115°)
∠7:
∠7 = ∠3 (Corresponding Angles)
∠7 = 65° (∠3 = 65°)
∠8:
∠8 = ∠4 (Corresponding angles)
∠8 = 115° (∠4 = 115°)
Solve for n.
n + 1 = 4(n-3)
n = 1
n = 8
n = 11
n = 16
Answers
Answer:
I think its n=1 but not quite sure.
PLZ HURRY IT'S URGENT!!!!
Represent the situation as a system of equations.
Rent a Truck rents a moving truck for $40.00 and $0.20 per mile.
Moving R Us rents the same moving truck for $1.00 per mile but with no upfront charge.
Let x represent the number of miles traveled.
Question 5 options:
y=40x+0.20 y=x+1
y=0.20x+40 y=x+1
y=40x+0.20 y=1.00x
y=0.20x+40 y=1.00x
Answers
Answer:
y=0.20x+40; y=1.00x
Step-by-step explanation:
Company 1 is charging upfront and then after u have a unknown variable for how many miles you drive. Company 2 is only charging you 1.00$ per mile driven and depending on how many miles you drove will depend on how much you will pay.
Which number sets (i.e. Natural, Whole, Integer, Rational, Real, etc.) are best suited to represent discrete functions? Why? Which number sets are best suited to represent continuous functions? Why?
Answers
Answer:
They are considered discrete
Step-by-step explanation:
because
Najat is selling raffle tickets. The table shows the cost (in dollars) of buying different numbers of tickets.
Using x for the number of tickets and y for the cost, do the following.
Write an equation relating x and y
Answers
Answer:
The equation relating x and y is: y=4x
Step-by-step explanation:
Let x represent number of tickets
and y represent cost
a) Plot the ordered pairs
The ordered pairs (1,4),(2,8),(3,12),(4,16) is plotted in figure attached.
b) Write an equation relating x and y
y= 4x
Now checking by putting values of x to see, if we get values of y
if x=1, then y=4x => y=4*1 =>y=4
if x=2 then y=4x => y=4*2 =>y=8
if x=3 then y=4x => y=4*3 =>y=12
So, we get same values as table.
The equation relating x and y is: y=4x
Where did the student go wrong?
Answers
Anyone wanna be freinds
Answers
Answer:
yes
Step-by-step explanation:
Answer:
sure......................................
what is the sum of (-2.1x + 3.7) and (5 + 4.9x)?
Answers
Answer: [tex]=2.8x+8.7[/tex]
[tex]=-2.1x+3.7+5+4.9x[/tex]
[tex]=(-2.1x+4.9x)+(3.7+5)[/tex]
[tex]=2.8x+8.7[/tex]
Chaz kept a record of how many gallons of gas he purchased each day last week. Drag and drop the days into the correct boxes to order the days from the least amount of gas Chaz purchased to the greatest amount of gas Chaz purchased.
Day Gas (in gallons)
Monday 4.5
Tuesday 3.6
Wednesday 4.252
Thursday 3.71
Friday 4.255
Answers
Answer:
The arrangement of days from least to greatest according to number of gallons is:
Tuesday
Thursday
Wednesday
Friday
Monday
Step-by-step explanation:
The given amount of gallons is in decimal form and we have to arrange the numbers in the order from least to greatest.
4.5 is the largest number in the given numbers.
Then comes 4.252 and 4.255
As 0.252<0.255 so 4.252 will be smaller.
The smallest number is 3.6
Arranging the numbers, we get
3.6
3.71
4.252
4.255
4.5
Now arranging the corresponding day to each number,
The arrangement of days from least to greatest according to number of gallons is:
Tuesday
Thursday
Wednesday
Friday
Monday
round 688. to the nearest hundred. Enter your answer in the box below.
Answers
Answer:
700
Step-by-step explanation:
thats the answer ik
Answer:
700
Step-by-step explanation:
688 is closer to 700 than 600 so it is rounded to 700
Write sin(x+1) in terms of unshifted sine and cosine. Write your answer using decimals.
Please provide explanation, I’m confused.
Answers
Answer: sin(x + 1) = 0.841*cos(x) + 0.540*sin(x)
Step-by-step explanation:
Here we can use the relation:
Sin(a + b) = sin(a)*cos(b) + sin(b)*cos(a)
In this case we have:
sin(x + 1)
This means that the graph of sin(x) is shifted one unit to the left.
But we can write this, using the above relation, as:
sin(x + 1) = sin(x)*cos(1) + sin(1)*cos(x)
Now we have no longer a shift, and we can replace:
sin(1) = 0.841
cos(1) = 0.540
Then:
sin(x + 1) = 0.841*cos(x) + 0.540*sin(x)
A high school coach wants to buy new shirts for the 25 members of the track team. The coach must spend less than $300 on the shirts and needs to figure out how much he can spend per shirt, s.
Which of the following must be true about the inequality and the resulting graph? Select three options.
The inequality should be written as 25 s less-than 300.
The inequality should be written as 25 s greater-than 300.
The circle is open.
The circle is closed.
The arrow points left.
Answers
The correct options are 1, 3 and 5.
Step-by-step explanation:
Let the price of a new shirts be s.
The number of members is 25. The price of 25 shirts is 25s.
The cost must be less than $300. It means
Therefore option 1 is correct.
Divide both sides by 25.
The sign of inequality is < instead of ≤. It means the 12 is not included in the solution set.
Open circle is used for "<" and ">". Closed circle is used for "≤" and "≥".
Since the sign of inequality is <, therefore the circle is open and option 3 is correct.
The value of s is less than 12.
Therefore the arrow points left and option 5 is correct.
Answer:
A,C,E
Step-by-step explanation:
i got it right on edge 2021
If y = -6 when x = 16, find y when x = 8.
Answers
Answer:
y=-3
Step-by-step explanation:
16/2=8
-6/2=-3
Answer:
-3
Step-by-step explanation:
I think this -6/16 = -3/8 divided both sides by 2
Can the following question be considered a statistical question and why or why not?
Do students at Bryan Middle School exercise?
Yes, it specifies the population
No, it does not specify the population
Yes, it anticipates enough variability in responses
No, it does not anticipate enough variability in responses
Answers
Answer: Yes, it anticipates enough variability in responses
Step-by-step explanation:
A statistical question is a question that can be answered by collecting data that vary. For example, “How old am I?” is not a statistical question, but “How old are the students in my school?” is a statistical question.
Write 0.0000000068 as a scientific notation
Answers
Answer:
10×6.8 to the 9th power
Factor the following expression:
14x+49
Answers
14x+49
7(2x+7)
Factor out 7
Answer: 7 out of 14x+49 = 7(2x+7)
14x+49
7(2x+7)
Hope this helps... Stay safe and have a great day/night!!!! :D
Which exponential expression represents the numerical expression 9⋅9⋅9?
93
39
3×9
9×3
Answers
Answer:
93
Step-by-step explanation:
Answer: The first one 9³
Step-by-step explanation:
Note: 9³ or nine to the third power or 9-cubed is correct, because we are multiplied the number 9 by itself, three times
The value equal to:
9*9*9 is equal to: 9³
that is, nine to the THIRD power or:
nine to the power of three
i will give brainilest
The table shows the number of each score earned by 120 students on a sixth grade mathematics test.
Score Number of Students
100 9
95 18
90 72
85 15
80 6
What is the ratio of students scoring above 80 to students scoring exactly 80 on this test?
Group of answer choices
1 to 20
19 to 1
1 to 19
20 to 1
Answers
Work:
Students scoring above 80 -
9+18+72+15= 114
Students score exactly 80-
6
114/6 = 19
19 students scored above 80 for every 1 student that scored exactly 80.
5r + 2d
I need to know the answer to this equation.
R = 3 and d = 5
brainliest and 30 points for correct answer and first person ONLY
Answers
Answer:
=25
Step-by-step explanation:
plug in the numbers for the variables
5(3)+2(5)
15+10
25
Matteo is following this recipe to mak
a cake.
He wants to make three of these
cakes.
How much of each ingredient does he
need?
Recipe: Makes 1 cake
6 ounces butter
5 ounces sugar
7 ounces of flour
3 eggs
2 teaspoons (tsps) baking powder
Pls help me I'm trying too sleep and they keep sending me homework
Answers
Answer:
Below is the step by step explaination of the procedure
Step-by-step explanation:
So since he wants to make three cakes we will multiply the recipe by 3 to get the amount of ingredients this person will need.
6*3 = 18 ounces of butter
5*3 = 15 ounces of sugar
7*3 = 21 ounces of flour
3*3 = 9 eggs
2 * 3 = 6 teaspoons of baking powder.
Nina likes to tip restaurant staff 18% when she enjoys the meal and has good service. Which expression represents the amount of tip, in dollars, that Nina will give when she has a positive experience eating a meal that cost n dollars? 0.18n 18n StartFraction n over 18 EndFraction n + 0.18
Answers
Answer:
18n
Step-by-step explanation:
just got done taking the test
Answer:
0.18n
Step-by-step explanation:
The area of the postcard pictured below is 24 square inches. What is the width b of the message section (in inches)? Pick the equation that would best model this situation.
A. 4(b + 3) = 24
B. 3(4 + b) = 24
C. 4(b - 3) = 24
D. 3(b - 4) = 24
Answers
Answer:
Step-by-step explanation:
4(b + 3) = 24
Answer:
A. 24 = 4(b + 3)Step-by-step explanation:
Area is equal to length times width. In this case, the length is b + 3 (since both b and 3 are part of the width, with the length being 4.
Substitute into the equation for area:
a = lw
a = 4(b + 3)
The area is 24, so the final answer is:
A. 24 = 4(b + 3)what is the variance of the following set of data? 5 ,55 , 505, 255, 5, 75 , 85, 65
Answers
Answer:
27964.286
Step-by-step explanation:
i just used calculator soup
Answer:
28,912
Step-by-step explanation:
i also used calculator soup but gave the right answer
If the number of dates Anna and John had is represented by three consecutive integers, what is the algebraic expression for
the total number of dates they have had?
Answers
Step-by-step explanation:
x,x+1,x+2
Topic: algebraic expression
If you like to venture further, feel free to check out my insta (learntionary). I'll be constantly posting math tips and notes! Thanks!
Let x represent the first date. The expression x+1 represents the second date. The expression x+2 represents the third date. The total number of dates as follows
3x+5=23 what is the value of x?
Answers
Answer:
X = 6
Step-by-step explanation:
Hope this helps!
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