Andy C. answered 03/23/18
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The mean (average) is 79.35714
The standard deviation is 17.11323
Upper fence is 3 standard deviations above the mean.
The lower fence is 3 standard deviations below the mean.
THe upper fence is 79.35714 + 3 *17.11323 = 130.6968
The lower fence is 79.35714 - 3 * 17.11323 = 28.01745