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3 years ago

Justificantion for x=8/15

Mathematics

1 answer:

Kruka [31]3 years ago

7 0

<h2>Answer:</h2>

as according to law if a number is multiplied at one side then it will be divide to other side

Step-by-step explanation:

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54394 plus 13768<br><br><br> Thank you

kakasveta [241]

Answer:

$54394 + 13768 \\ \\ = 68162$

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3 years ago

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Which is the correct classification of Sqrt of 18 ?

LenKa [72]

The square root of 18 is 4.24

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3 years ago

PLEASE HELP FIRST GETS BRAINLIEST!!!!!!!!!!!

Shalnov [3]

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3 years ago

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It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir

Ksju [112]

Answer:

We need a sample size of at least 75.

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:

$\alpha = \frac{1-0.95}{2} = 0.025$

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 $1-0.025 = 0.975$ , so $z = 1.96$

Now, we 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.

The standard deviation is the square root of the variance. So:

$\sigma = \sqrt{484} = 22$

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

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

$5 = 1.96*\frac{22}{\sqrt{n}}$

$5\sqrt{n} = 43.12$

$\sqrt{n} = \frac{43.12}{5}$

$\sqrt{n} = 8.624$

$(\sqrt{n})^{2} = (8.624)^{2}$

$n = 74.4$

We need a sample size of at least 75.

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3 years ago

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What is the inverse of p(m) = m/5 + 8

zvonat [6]

The inverse is just switching y and x your answer should be . p^-1 (m)=5m-40

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2 years ago