Question: For a 3-sigma x-bar chart where the process standard deviation is known, the upper control limit: is 30 below the mean of sample means for

For a 3-sigma x-bar chart where the process
For a 3-sigma x-bar chart where the process standard deviation is known, the upper control limit: is 30 below the mean of sample means for a 3o control chart. is 30 above the mean of sample means for a 30 control chart. is 3o/below the mean of sample means for a 30 control chart. is 3/1 above the mean of sample means for a 30 control chart. cannot be calculated unless the average range is known

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