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Mathematics, 25.04.2020 03:48 cgkiepe5759

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 when this service life is in control it 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 Service Life hours) 1 495 500 505 500 2 525 515 505 515 3 470 480 460 470 What is the sample means service life for sample 2

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