Studies on a machine that molds plastic water pipe indicate that when it is injecting 1-inch-diameter pipe, the process standard deviation is 0.05 inches. The 1-inch pipe has a specification of 1 inch plus or minus 0.10 inch. What is the process capability index ( C_pk) if the long-run process mean is 1 inch?

Group of answer choices

0.50

0.67

1.00

2.00

2.20

The specifications for a product are 6 mm 0.1 mm. The process is known to operate at a mean of 6.05 with a standard deviation of 0.01 mm. What is the C_pk for this process?

Group of answer choices

3.33

1.67

5.00

2.50

1.33