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C-Spec, Inc., is attempting to determine whether an existing machine is capable of milling an engine part that has a key spec

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Answer #1

UPPER LIMIT = 3.04
LOWER LIMIT = 2.96
MEAN = 3.02
STDEV = 0.05

PROCESS CAPABILITY INDEX = MIN(UPPER LIMIT - MEAN / 3 * STDEV, MEAN - LOWER LIMIT / 3 * STDEV)

PROCESS CAPABILITY INDEX = MIN((3.04 - 3.02) / 3 * 0.05), (3.02 - 2.96) / 3 * 0.05)
PROCESS CAPABILITY INDEX = MIN(0.1333, 0.4)
PROCESS CAPABILITY INDEX = 0.133

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