Problem $10-9($Static$)$

After a number of complaints about its tech assistance, a computer manufacturer examined samples of calls to determine the frequency of wrong advice given to callers. Each sample consisted of $100$ calls.

$1$

$2$

$5$

$3$

$3456$

$5$

$746$

$7$

$8$

SAMPLE

$8910$

$11$

$1213141516$

$459345667$

Number of errors

Click here for the Excel Data File

a$.$ Determine $95$ percent limits$.($Do not round your intermediate calculations. Round your final answers to $2$ decimal places. Round up any negative control limit value to zero.$)$

UCL

LCL

b$.$ Is the tech assistance process stable $($i$.$e$.,$ in control$)?$

The process is in control.

The process is not in control.