High Quality Content by WIKIPEDIA articles! In statistics, the 68-95-99.7 rule, or three-sigma rule, or empirical rule, states that for a normal distribution, nearly all values lie within 3 standard deviations of the mean. About 68% of the values lie within 1 standard deviation of the mean. In statistical notation, this is represented as: About 95% of the values lie within 2 standard deviations of the mean. The statistical notation for this is: .

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