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3 years ago

The regular price of a stainless steel iron is $30.00. Today it is on sale for 40% off. What is the sale price?

Mathematics

2 answers:

tankabanditka [31]3 years ago

8 0

The answer is $12.00

vagabundo [1.1K]3 years ago

6 0

The answer is $18.00 dollars. Have a nice day!

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3 years ago

We intend to estimate the average break time of Dunder Mifflin employees. From a previous study, we believe that the average tim

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The minimum sample size that we should consider is of 60 employees.

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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.

We want our 99 percent confidence interval to have a margin of error of no more than plus or minus 2 minutes. What is the smallest sample size that we should consider?

We need to find n for which $M = 2, \sigma = 6$

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

$2 = 2.575*\frac{6}{\sqrt{n}}$

$2\sqrt{n} = 2.575*6$

Simplifying by 2

$\sqrt{n} = 2.575*3$

$(\sqrt{n})^{2} = (2.575*3)^{2}$

$n = 59.67$

Rounding up

The minimum sample size that we should consider is of 60 employees.

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