Q$3.$

$($a$)$ Define Statistical Process Control? Also Name Different types of Control Charts.

$($b$)$ Auto Pistons at Avari Plant in Karachi are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of $10$ pistons each day, the mean and the range of this diameter have been as follows:

$\backslash$table$[[$Day$,$Mean $(mm),$Range $(mm)$