Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 29.31 mm diameter pipe, the process standard deviation is 0.45

Studies on a machine that molds plastic water pipe indicate that when it is injecting 29.31 mm diameter pipe, the process standard deviation is 0.45 mm. The pipe has a specification of 29.31 mm plus or minus 2.2 mm. What is the process capability index (Cp)?

a. 4.889

b. 1.63

c. 3.259

d. 0.8148

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