Please help my revision question.

3. A process is in statistical control with X(=) = '35 and 5 = 2. The control chart uses a sample size of n = 5. Specications are at 80 :t 8. The quality characteristic is normally distributed? {a} Estimate the C}, and Cpk. (b) How much could process fallout he reduced by shifting the mean to the nominal dimension? Answers: (a) 25 and 0.47; (11) From 19% to I?2ppm