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An import -export company wants to know the overall average cost of mailing packages. The company randomly selected 21 days and determined that the average

An import -export company wants to know the overall average cost of mailing packages. The company randomly selected 21 days and determined that the average daily cost of postage that sample was $32.00. The sample standard deviation is $2.55.Construct a 99% confidence interval for the mean daily cost of postage .

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