Question: A manager wants to build 3-sigma control limits for a process. The mean of the process () is 10 units, and the standard deviation of

A manager wants to build 3-sigma control limits for a process. The mean of the process () is 10 units, and the standard deviation of the process () is 6. If samples of size 9 are to be taken, the UCL and LCL for the x-bar chart will be

16 and 4.

-8 and 28.

8 and 12.

8 and 16.

12 and 8.

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