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68–95–99.7 rule

Definition of the noun 68–95–99.7 rule

What does 68–95–99.7 rule mean as a name of something?


  1. [statistics] That a normal distribution has 68% of its observations within one standard deviation of the mean, 95% within two, and 99.7% within three.


68–95–99.7 rule: In statistics, the 68–95–99.7 rule, also known as the three-sigma rule or empirical rule, states that nearly all values lie within three standard deviations of the mean in a normal distribution.

  • also known as 68-95-99.7 rule

Printed encyclopedias and other books with definitions for 68–95–99.7 rule

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Google previewEncyclopedia of Mathematics (2005)

by James Stuart Tanton

From the study of the NORMAL DISTRIBUTION, the 68–95–99.7 rule states that 95 percent of the measurements  ...

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Quotes about 68–95–99.7 rule

Rule No.1: Never lose money. Rule No.2: Never forget rule No.1. (Warren Buffett)
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