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Before bidding on a contract a contractor wants to be 90

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Before bidding on a contract, a contractor wants to be 90% confident that he is in error by less than 20 minutes in estimating the average time it takes a certain kind of cement to dry. If the standard deviation of the time it takes to dry can be assumed to be 75 minutes, on how large a sample should he base the estimate?

Reference no: EM13620910

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