Copyright 2006 John Wiley & Sons, Inc.4-47 Computing C pk Net weight specification = 9.0 oz  0.5 oz Process mean = 8.80 oz Process standard deviation = 0.12 oz C pk = minimum = minimum, = 0.83 x - lower specification limit 3  = upper specification limit - x 3  =, 8.80 - 8.50 3(0.12) 9.50 - 8.80 3(0.12)
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