The manager of the National Bank wants to monitor the service times spent at the tellers. He has randomly timed three service times (in minutes) for five days as shown below: (Note: Table for factors is given on the Formula sheet). The calculated Xbar and Range values for the first 5 days are shown below. Find the 3 standard deviation Average (X-bar) and Range Control Limits (UCLxar LCLxar. UCLRand LCLR) 2. Show your solution for average and range chart limits b. Es process in control? Explain why Your Answer: The 3 standard deviation average is 7.93 . The lower control limit is 0.64 and the upper control limit is 6.54 . The process is not in control because many different data points go out of the set control limits such as 12 and 21