Question: 35 A design engineer wants to construct SPC chart for controlling the service life of a halogen headlamp his company produces. On three recent production

35 A design engineer wants to construct SPC chart for controlling the service life of a halogen headlamp his company produces. On three recent production batches, he tested service life on random samples of four headlamps, with these results: If it is know that the process standard deviation is 20, and the expected tolerance limits are [420, 580], what is the process capability index from the sample

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