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A set of data from a process has 8 readings per sample and 50 samples.

A set of data from a process has 8 readings per sample and 50 samples. The mean of the 50 sample means is 12.62. The mean of the 50 ranges is 0.18. Find the control limits for the xbar chart.

A.

12.55 and 12.69

B.

12.11 and 13.13

C.

12.54 and 12.70

D.

none of the above

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