An operator has found the upper limit to be 42.64 and the lower limit to be 36.22 . The operator uses subgroups of size 3 and there are 25 subgroups. The sum of your sample standard deviations is 25. Calculate your process capability index? What action would you recommend? Show all work. What is the Cpk value if the process average is 39.43, 40.58 and 38.2 ? What does this information tell you about the process? Show all your work.