Solve both $4$a and b

if you skip any one $,$ you get dislike

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$4($a$)$ What do you mean by work study? Explain the basic procedure involved in method study and work measurement.

$($b$)$ A simple of $100$ automobile bearing is inspected daily for continuously $10$ days. Draw the $p$ chart with the control limits and interpret the results using the following data.

$\backslash$table$[[$Date :$,1,2,3,4,5,6,7,8,9,10],[$Defectives :$,18,12,6,15,2,20,14,10,8,8]]$