Empirical Rule
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Empirical Rule (also known as the 68-95-99.7 Rule)
In a Normal Distribution with mean μ and standard deviation σ:
- Approximately 68% of the observations fall within σ of the mean μ.
- Approximately 95% of the observations fall within 2σ of the mean μ.
- Approximately 99.7% of the observations fall within 3σ of the mean μ.
This result is known as the empirical rule.
Daren, S. S., & Tabor, J. (2020). Updated version of the practice of Statistics (Teachers Edition) (Sixth Edition). W H Freeman & CO LTD.
contributed by Katie Ciskowski
