control chart such that it has two$-$sided probability control limits of $=0\mathrm{.}06,$ approximately. Give the center line and control limits$.$

$7\mathrm{.}68.$ The manufacturer wishes to set up a control chart at the final inspection station for a gas water heater. Defects in workmanship and visual quality features are checked in this inspection. For the past $22$ working days, $176$ water heaters were inspected and a total of $924$ nonconformities reported.

$($a$)$ What type of control chart would you recommend here, and how would you use it$?$

$($b$)$ Using two water heaters as the inspection unit, calculate the center line and control limits that