The standard deviation is around 2.8. how many students, Ask an Expert

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A study on students drinking habits wants to determine the true average number of alcoholic drinks all UF "non-greek" (ones who do not belong to a fraternity or sorority) students have in a one week period. We know from preliminary studies that the standard deviation is around 2.8. How many students should be sampled to be within 0.5 drink of population mean with 95% probability?

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