Question: A design engineer wants to construct a mean chart for controlling the service life of a halogen headlamp his company produces. He tested service life

A design engineer wants to construct a mean chart

A design engineer wants to construct a mean chart for controlling the service life of a halogen headlamp his company produces. He tested service life on randomly picked three samples with four headlamps each, with these results: What is the estimate of the process mean for whenever it is in control? 495 hours 470 hours 515 hours 500 hours

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