Question: A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company producesHe knows from numerous

A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company producesHe knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hoursOn three recent production batcheshe tested service life on random samples of four headlamps, with these results

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