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, he tested service life on random samples of four headlamps, with these results. If he uses upper and lower control limits of 520 and 480 hours, compute the Lower controllimit for the Range Chart Sample Service Life (hours) 495 500 505 500 525 515 305 515 470 480 460 470 0 0.0456 16.67 15.35 not enough information

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