Required: Develop and evaluate a level aggregate plan using inventories and back orders (4 Points). 4. A quality control inspector at the Crunchy Potato Chip Company has taken five samples (one per day) with four observations each of the volume of bags filled. The data and the computed means are shown in the following table: (4 Points) Sample Numbers Observations 1 2 3 4 1 23 22 23 24 2 23 21 19 21 3 20 19 20 21 4 18 19 20 19 5 18 20 22 20 If the standard deviation of the operation, from historical data, is known to be 0.2 ounces, use the information in the table to develop control chart with 3-sigma limits for the operation. a. Determine the process average, UCL and LCL of the X-chart. b. Determine the process average, UCL and the LCL for the R-chart. c. Develop an R-chart for this process. d. Is the process in control? Explain your answer. (Consider the solution obtained under "c")