Three Sigma Rule

Three sigma rule also referred to as 68–95–99.7 rule is a statistical method that refers to values that lie within three standard deviations from the mean.  The rule is used to get the probability of an event using the standard deviation and where events are normally distributed.

The Thee Sigma Rule states that even for unevenly distributed events, 88.8% should be between the upper and lower limits of three sigma intervals.

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