Question: D Question 35 4 pts A design engineer wants to construct a sample mean chart for controlling the service life of one of the types

D Question 35 4 pts A design engineer wants to construct a sample mean chart for controlling the service life of one of the types of light bulbs his company produces. He knows from numerous previous samples that this service life 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 bulbs, with these results: Samole SERVICE LIFE hours! 1 495 505 500 505 2 525 515 505 515 3 475 485 465 475 If he uses upper and lower control limits of 505 and 470 hours, on what sample(s) (if any) does service life appear to be out of control? Sample 1 Sample 2 Sample 3 Samples 163 The correct answer is not provided

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