Question: show work please A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces.

show work please

A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. On three recent production batches, he tested service life on random samples of four (n-4) headlamps, with these results: Service Life Sample 1 2 3 4 1 495 500 505 500 2 525 515 505 . 515 3 500 510 500 490 What is the grand mean of the sample means (X-double bar). A. 250 hours B 470 hours C. 495 hours

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