Question: An efficiency expert wishes to determine the average time that it takes to drill three holes in a certain metal clamp. How large a sample

An efficiency expert wishes to determine the average time that it takes to drill three holes in a certain metal clamp. How large a sample will he need to be 95% confident that his sample mean will be within 15 seconds of the true mean? Assume that it is known from previous studies that a = 40 seconds.

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