<PRE><B>Question 1118454</B>
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 140 days, with a standard deviation of 11 days. If you must estimate the population mean within 4 days, how many outside salespeople should you sample? Use the 99% confidence level. (Round the intermediate calculation to 3 decimal places. Round the final answer to the nearest whole number.) 
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n = (z*s/E)^2
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n = (2.5758*11/4)^2 = 51 when rounded up
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Cheers,
Stan H.
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