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The specifications for a particular part are "10 +/-0.015". The associated process produces parts with a mean of 10 and a standard deviation of 0.002. The process capability index is:
Correct Answer: C
Section: (none) Explanation/Reference: Process Capability Index is the expected fraction of non-conforming units and is given by: PCI = (Upper Spec Limit - Lower Spec Limit) / (6 Sigma) = (10.015 - 9.985) / (6 * 0.002) = 0.03 / 0.012 = 2.5, so answer is c.