Question: bed/bomento considered the Close Win Moving to another question will save this response Question 36 of stion 36 1 points A design engineer wants to

bed/bomento considered the Close Win Moving to another question will save this response Question 36 of stion 36 1 points 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 Sample Service Life hours) 495 500 505 500 525 515 305 315 470 480 460 470 What is the value of the center line for the x-bar chart? A. 250 hours B. 470 hours C. 487 hours D. 500 hours . E. none of the above

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