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3 years ago

12

The wholesale price for a pillow is 8.50. A certain department store marks up the wholesale price by 90%. Find the price of the

pillow in the department store.

2 answers:

Fofino [41]3 years ago

8 0

Answer:

16.15 ($) or currency

Step-by-step explanation:

initial cost 850

new price = 8,5 x 1.90 = 16.15

Andrei [34K]3 years ago

8 0

16.50$ or whatever the currency is

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Answer:

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Step-by-step explanation:

1. put your Xs and Ys over 2

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3. Divide

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3 years ago

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3 years ago

A simple random sample of 100 8th graders at a large suburban middle school indicated that 87% of them are involved with some ty

UkoKoshka [18]

Answer:

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$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

And the margin of error is given by:

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Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by:

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$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

And the margin of error is given by:

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Step-by-step explanation:

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