Problem $10-7($Static$)$

The postmaster of a small western town receives a certain number of complaints each day about mail delivery.

DAY

$1234567891011121314$

Number of complaints $4101489651213764210$

Click here for the Excel Data File

a$.$ Determine three$-$sigma control limits using the above data. $($Do not round intermediate calculations. Round your final answers to $3$ decimal places. Leave no cells blank $-$ be certain to enter $"0"$ wherever required. Round up any negative control limit value to zero.$)$