Question: QUESTION 9 4 points A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company

QUESTION 9 4 points A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces, He knows from numerous previous samples that when this service life is in control it is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results: Compute the Upper Control Limit for the Range chart Sample 1 500 Service Life (hours) 500 500 515 530 480 490 490 520 475 2 3 515 470 51 hours O 474 hours O 49 hours 44 hours O 34 hours

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