The specification for the diameters of ball bearings is 15.40–15.60 mm. Data from an X chart, based.

The specification for the diameters of ball bearings is 15.40–15.60 mm. Data from an X chart, based on samples of size 8, that shows that the process is in control, yield values of X = 15.52 and R = 0.05. a. Compute the value of Cpk for this process. b. Is the process capability acceptable? Explain.