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Bess [88]
2 years ago
9

At the local college, a study found that students earned an average of 14 credit hours per semester. A sample of 138 students wa

s taken. What is the best point estimate for the average number of credit hours per semester for all students at the local college?
Mathematics
1 answer:
77julia77 [94]2 years ago
6 0

Answer:

1932 credit hours

Step-by-step explanation:

Create a proportion

credits             credits

----------     =      ----------

students          students

14      ?

---- = -----

1         138

14 times 138

1932 credit hours

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2. A printing machine makes 240 books
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Answer: 8 books/ hour

Explanation:

240 / 30 = 8 books/ hour

I hope this helped!

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7 0
2 years ago
Read 2 more answers
3^2 - 17x - 28<br> Thank you
V125BC [204]
Simplfy then combine like terms so the anwser Simplified and Evaluated is -17x-19
8 0
2 years ago
Read 2 more answers
On a coordinate plane, a function has four connecting lines. The first line goes from (0, 0) to (2,2), the second line goes from
musickatia [10]

Answer: -2, -1, -2, -3 on Edge

3 0
3 years ago
Read 2 more answers
A research group needs to determine a 90% confidence interval for the mean repair cost for all car insurance small claims. From
lutik1710 [3]

Answer:

a) z = 1.645

b) The should sample at least 293 small claims.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.9}{2} = 0.05

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.05 = 0.95, so z = 1.645, which means that the answer of question a is z = 1.645.

Now, find  the margin of error M as such

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

(b) If the group wants their estimate to have a maximum error of $12, how many small claims should they sample?

They should sample at least n small claims, in which n is found when

M = 12, \sigma = 124.88. So

M = z*\frac{\sigma}{\sqrt{n}}

12 = 1.645*\frac{124.88}{\sqrt{n}}

12\sqrt{n} = 205.43

\sqrt{n} = \frac{205.43}{12}

\sqrt{n} = 17.12

\sqrt{n}^{2} = (17.12)^{2}

n = 293

The should sample at least 293 small claims.

8 0
2 years ago
11. Find the product of (3x+5) with (2x - 3) in simplest form.
STatiana [176]

Answer:

(3x + 5)(2x - 3) = 6x² + x - 15

Step-by-step explanation:

To find the product of two binomials, we could use the FOIL method.

First

Outer (Outside)

Inner (Inside)

Last

(3x + 5)(2x - 3) = (3x)(2x) + (3x)(-3) + (5)(2x) + (5)(-3) = 6x² - 9x + 10x - 15 = 6x² + x - 15

So the product of the two binomials would be 6x² + x - 15.

I hope you find my answer and explanation to be helpful. Happy studying.

3 0
3 years ago
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