Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 28.32 mm diameter pipe, the process standard deviation is 0.87

Studies on a machine that molds plastic water pipe indicate that when it is injecting 28.32 mm diameter pipe, the process standard deviation is 0.87 mm. The pipe has a specification of 28.32 mm plus or minus 1.09 mm. What is the process capability index (Cp)?

a. 0.4176

b. 0.2088

c. 0.8352

d. 1.253

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