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Definition of 'Empirical Rule'
A statistical rule stating that for a normal distribution, almost all data will fall within three standard deviations of the mean. Broken down, the empirical rule shows that 68% will fall within the first standard deviation, 95% within the first two standard deviations, and 99.7% will fall within the first three standard deviations of the mean.
Also referred to as the Three Sigma Rule, or the 68-95-99.7 Rule.
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