Question: Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.92 mm diameter pipe, the process standard deviation is 0.49

Studies on a machine that molds plastic water pipe indicate that when it is injecting 25.92 mm diameter pipe, the process standard deviation is 0.49 mm. The pipe has a specification of 25.92 mm plus or minus 2.25 mm. What is the process capability index (Cp)?

a.

4.592

b.

1.531

c.

3.061

d.

0.7653

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