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3 years ago

HELPPP PWEEESEE IM LEGIT SOOOOO CONFUSEDDDD

Mathematics

1 answer:

MAVERICK [17]3 years ago

4 0

Answer: is this what your looking for

Step-by-step explanation:

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Find the measure of one interior angle of a regular 21-gon.

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C step-by-step the coordinate of that is pretty simple to say but hard at the same time

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1. What is the ratio of black to white squares? (1 mark)<br> I

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Find the slope of the line passing through the two points.<br><br> (2.1, 3.8), (3.1, 7.6)

bixtya [17]

Answer:

3.8

Step-by-step explanation:

Slope formula- m = y2 - y1

x2 - x1

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2 years ago

Suppose that scores on the mathematics part of a test for eighth-grade students follow a Normal distribution with standard devia

riadik2000 [5.3K]

Answer:

We need an SRS of scores of at least 153.

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 $z = 1.645$

Now, find 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.

How large an SRS of scores must you choose?

This is at least n, in which n is found when $M = 20, \sigma = 150$ . So

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

$20 = 1.645*\frac{150}{\sqrt{n}}$

$20\sqrt{n} = 1.645*150$

$\sqrt{n} = \frac{1.645*150}{20}$

$\sqrt{n} = 12.3375$

$(\sqrt{n})^{2} = (12.3375)^{2}$

$n = 152.2$

Rounding to the next whole number, 153

We need an SRS of scores of at least 153.

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3 years ago

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OLEGan [10]

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