The following table shows the actual measurements (in inches) taken in recent samples. Each sample contains 3 observations.a) Complete the table. Calculate the grand mean (i.e., the average of sample means) and the average of sample range.b) Construct and plot the X(bar)- and R-charts.c) According to the X(bar)- and R-charts, is the process in control? Do you think corrective actions are needed?