Question 41 (6 points) A design engineer wants to construct a sample mean chart

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Question 41 (6 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 Hours 509 500 498 493 498 501 489 501 520 504 501 502 What is the sample mean service life for sample 2? (Keep two decimal places) Your Answer Answer

Explanation / Answer

Solution:- Given data for the sample 2 500 , 498 , 501 , 501

sample mean = sum of terms / number of terms

= 2000/4

= 500

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