Question: 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

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 this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, ho tested service life on random samples of four headlamps, with these results. What are the x-bar chart upper and lower control limits? Sample Service Life Chours) 1 495 500 SOS 500 2 525 S15 505 S15 3 470 480 460 470 C. 500 and 475 OB 507 and 483 0.523 and 515 O A 460 and 440 O E 552 and 544 Newt

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