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3 years ago

Find the perimeter of the figure 13.5 ft 9 ft 12.5 ft

Mathematics

2 answers:

saveliy_v [14]3 years ago

5 0

Answer:

Add all the values up and then divide by 2

Step-by-step explanation:

N76 [4]3 years ago

4 0

Answer:

Step-by-step explanation:

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Does the table show an exponential function?

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Yes it does the line will gradually increase

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3 years ago

A Confidence interval is desired for the true average stray-load loss mu (watts) for a certain type of induction motor when the

Vaselesa [24]

Answer:

A sample size of 35 is needed.

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, find the width W as such

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

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

How large must the sample size be if the width of the 95% interval for mu is to be 1.0:

We need to find n for which W = 1.

We have that $\sigma^{2} = 9$ , then $\sigma = \sqrt{\sigma^{2}} = \sqrt{9} = 3$ . So

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

$1 = 1.96*\frac{3}{\sqrt{n}}$

$\sqrt{n} = 1.96*3$

$(\sqrt{n})^2 = (1.96*3)^{2}$

$n = 34.57$

Rounding up

A sample size of 35 is needed.

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3 years ago

Jim rolls a fair, normal 6-sided dice.

xenn [34]

Answer:

2/3

Step-by-step explanation:

On a 6-sided dice, there are only 4 numbers that are less than five. That's 4/6 or 2/3.

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