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What is the Empirical Rule?

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The empirical rule states that for normally distributed data, almost all of the data will fall within 3 standard deviations of the mean.  This is broken into three parts.

  • 68% of the data falls within the first standard deviation from the mean.
  • 95% fall within two standard deviations.
  • 99.7% fall within three standard deviations.

Summarized from https://www.statisticshowto.datasciencecentral.com/empirical-rule-2/

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