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PSYCHO15rus [73]

4 years ago

15

The wholesale price for a shirt is $6.50. A certain department store marks up the wholesale price by 60% . Find the price of the

shirt in the department store. Round your answer to the nearest cent, as necessary.

1 answer:

statuscvo [17]4 years ago

5 0

3.90 I’m not really sure though

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Answer:

We have been given confidence interval 95%, mean 20 , data set 30 and standard deviation 3.

We will use the formula: $mean\pm \frac{\sigma}{\sqrt{n}}\cdot (z-score)$

Here, $mean=20,\sigma=3,n=30,z-score=1.96$

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On substituting the values in the formula to plug the values:

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Now, we have a formula for marginal error: $z\cdot \frac{\sigma}{\sqrt{n}}$

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