Question: A quality inspector took four samples, each with five observations, of the duration of a customer service at a station. The following table shows her

A quality inspector took four samples, each with

A quality inspector took four samples, each with five observations, of the duration of a customer service at a station. The following table shows her observations in minutes. What is the three-sigma upper control limit for the sample mean? Sample (in minutes) #1 #2 #3 6 4 5 #4 6 7 6 7 8 6 7 6 12 10 11 10 8 11 10 12 9 11.675 14.005 14.485 16.840 None of the above

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