Question: A certain process is under statistical control and has a mean value of = 100 and a standard deviation of = 10. The specifications for

A certain process is under statistical control and has a mean value of = 100 and a standard deviation of = 10. The specifications for this process are USL = 120 and LSL = 70.

a. Calculate Cp and Cpk.

b. Which one of these indices is a better measure of process capability? Why?

c. Assuming a normal distribution, what percent of the product can be expected to fall outside the specifications?

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