able $5$E$\mathrm{.}3$ presents $20$ subgroups of five meas$-$urements on the time it takes to service a customer.a$.$Set up and Rcontrol charts for this process andverify that it is in statistical control.b$.$Following establishing of the control charts inpart $($a$),10$ new samples have been provided inTable $5$E$\mathrm{.}4.$ Plot the new and Rvalues usingthe control chart limits you established in part$($a$)$ and draw conclusions.c$.$Suppose that the assignable cause responsible forthe action signals generated in part $($b$)$ has beenidentified and adjustments made to the processto correct its performance. Plot the and Rval$-$ues from the new subgroups shown in Table $5$E$\mathrm{.}5$which were taken following the adjustmentagainst the control chart limits established in part$($a$).$ What are your conclusions