Question: For a 3 - sigma x - bar chart where the process standard deviation is known, the upper control limit: is 3 sigma below

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

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