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2 years ago

11

A 2-foot piece of aluminum wire costs $12.00. What is the price per inch?

2 answers:

bagirrra123 [75]2 years ago

3 0

$6:00

First you can see that it’s 2:12 so if you break it into a half you get 1:6 so the answer is $6:00 per inch

kow [346]2 years ago

3 0

Answer: 50 cents

Step-by-step explanation:

When looking at this problem, you want to convert feet to inches. Because you have 2 feet, you know that is 24 inches, so now, we have established that it's asking what is the price per inch of this wire, and there are 24 inches. To find your answer, you are just going to divide 12 by 24 (you should have 12/24), and that is going to give you 0.5, or 50 cents. If you want to check yourself, you can multiply 0.5*24 (your price per inch times how much wire) and you will get 12, the total price paid. Hope this helps!

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Answer:

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Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

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The margin of error is:

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This means that $\pi = 0.25$

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This is n for which M = 0.03. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 1.96\sqrt{\frac{0.25*0.75)}{n}}$

$0.03\sqrt{n} = 1.96\sqrt{0.25*0.75}$

$\sqrt{n} = \frac{1.96\sqrt{0.25*0.75}}{0.03}$

$(\sqrt{n})^2 = (\frac{1.96\sqrt{0.25*0.75}}{0.03})^2$

$n = 800.3$

Rounding up:

The required sample size for the new study is 801.

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Step-by-step explanation:

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