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 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 range?

Sample (in minutes)
#1 #2 #3 #4
6 4 5 6
7 6 7 8
6 7 6 12
10 11 10 8
11 10 12 9

10.0225

11.6050

13.1875

14.3275

None of the above

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