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3 years ago

800 out of 1/10 is what?

Mathematics

2 answers:

dexar [7]3 years ago

5 0

The answer is 80.

Please mark brainliest

lesya692 [45]3 years ago

4 0

Answer:

If you meant what is 1/10 of 80 the answer is 80

Step-by-step explanation:

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you want to create a 99 confidence interval with a margin of error of 25 assuming that the population standard deviation is equa

Ahat [919]

Answer:

The minimum sample size is 239.

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:

$\alpha = \frac{1 - 0.99}{2} = 0.005$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.005 = 0.995$ , so Z = 2.575.

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.

Population standard deviation is equal to 1.5

This means that $\sigma = 1.5$

Margin of error of 0.25

This means that $M = 0.25$

What's the minimum size of the sample?

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

$0.25 = 2.575\frac{1.5}{\sqrt{n}}$

$0.25\sqrt{n} = 2.575*1.5$

$\sqrt{n} = \frac{2.575*1.5}{0.25}$

$(\sqrt{n})^2 = (\frac{2.575*1.5}{0.25})^2$

$n = 238.7$

Rounding up:

The minimum sample size is 239.

4 0

3 years ago

The diagram shows two congruent regular polygons joined together.

svlad2 [7]

10 sides

360-72=288
288 divided by 2 is 144
Decagon have 144 degree interior angles

4 0

3 years ago

A baker made two cakes of the same size.

dybincka [34]

Your question seems to be incomplete

6 0

2 years ago

5 -2 (4a + 1) + 3a = 13 what is (a) equal to a) - 6/5 b) - 2 c) 2 d) 6/5

Sidana [21]

The correct answer is a= -2

4 0

3 years ago

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Given that y = 9x + 2, what is the slope?<br> A. 2 B.x C. 9 D.11

tia_tia [17]

Answer:

c.9

Step-by-step explanation:

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3 years ago

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