Determine three$-$sigma control limits using the above data. $($Round your intermediate calculations to $4$ decimal places

and final answers to $3$ decimal places. Leave no cells blank $-$ be certain to enter $"$O$"$ wherever required. Round up any negative

control limit value to zero.$)$

Answer is complete but not entirely correct.The postmaster of a small western town receives a certain number of complaints each day about mail delivery.

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a$.$ Determine three$-$sigma control limits using the above data. $($Round your intermediate calculations to $4$ decimal places

and final answers to $3$ decimal places. Leave no cells blank $-$ be certain to enter $"0"$ wherever required. Round up any negat

control limit value to zero.$)$