statistics

In order to wet rates, an Insurance company is trying to estimate the number of sick days that full time workers at an auto repair shop top per you: A previous study indicated that the standard deviation was $ 3 days, How large a womphe must be selected ? the company wants to be 99% confidant that De true main differs from the sample mean by no more than I day? 157 5 Q 103 Contrat W E rin