3 years ago

Find the area. The figure is not drawn to scale. 7.6. 3.7

Mathematics

1 answer:

lora16 [44]3 years ago

6 0

Answer:

28.12

Step-by-step explanation:

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2 years ago

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A rectangle is 30 inches long. The diagonal is 50 inches how wide is the rectangle?

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Lelu [443]

Answer:

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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:

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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 $1-0.005 = 0.995$ , 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.

In this question:

$n = 25, \sigma = 3.8$

$M = 2.575*\frac{3.8}{\sqrt{25}} = 1.90$

So the correct answer is:

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3 years ago

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2 years ago