Question: SHOW WORK PLEASE A design engineer wants to construct a sample mean chart for controfling the service life of a halogen headlamp his company produces.

SHOW WORK PLEASE A design engineer wants to
SHOW WORK PLEASE A design engineer wants to
SHOW WORK PLEASE
A design engineer wants to construct a sample mean chart for controfling 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, he tested service life on random samples of four headlamps, with these results: Sample 1 495 500 505 500 515 2 525 515 505 3 470 480 460 470 What is the three sigma upper control limit for the process

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