Before bidding on a contract, a contractor wants to be 95% confident that he is in error by less
Question: 7. Before bidding on a contract, a contractor wants to be 95% 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 72 minutes, on how large a sample should she base the estimate?
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