Problem $10-7$

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

$\backslash$table$[[,1,2,3,4,5,6,7,8,9,10,11,12,13,14],[$Number of complaints,$4,10,14,8,9,6,5,12,13,7,6,4,2,10]]$

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 $"$O$"$ wherever required. Round up any negative control limit value to zero.$)$

b$.$ Is the process in control?

Yes

$$ No