Question: A design engineer wants to construct a sample mean chart for controlling the service life of one of the types of light bulbs his company

A design engineer wants to construct a sample

A design engineer wants to construct a sample mean chart for controlling the service life of one of the types of light bulbs 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 bulbs, with these results: Sample 4951 525 470 Service Life (hours) 5001 505 515 5051 480 460 22 500 515 470 What is the standard deviation of the sampling distribution of sample means? Multiple Choice O 5 hours O 6.67 hours 10 hours 11.55 hours O 20 hours

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