Answer stat questions pt 2

Can you help me understand this Statistics question?

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16. Assume that you want to construct a 95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. The sample standard deviation is given below.

Margin of error =$6, standard deviation =$25

The required sample size is .

(Round up to the nearest whole number as needed.)

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