The average time it takes for a customer service representative to resolve a support ticket is targeted

to be $10$ minutes per ticket in average. To assess the efficiency of the support team, five samples

of four observations each have been recorded to measure the actual time it takes to resolve support

tickets. Use the sample data below in conjunction with Table in the slides to construct upper and

lower control limits for both sample mean and sample range control charts. Do the results suggest

that the process is in control?