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Suppose it is desired to estimate the average time a customer spends in a particular store to within 5 minutes with 99% confidence. It is

Suppose it is desired to estimate the average time a customer spends in a particular store to within 5 minutes with 99% confidence. It is estimated that the range of the times a customer spends in the store is 90 minutes. How large a sample should be taken to get the desired interval?

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