Empirical Rule Calculator Widget
About the Empirical Rule
The Empirical Rule, also known as the 68-95-99.7 rule, is a fundamental concept in statistics that describes the distribution of data in a normal distribution:
- Approximately 68% of the data falls within one standard deviation of the mean (μ ± σ)
- Approximately 95% of the data falls within two standard deviations of the mean (μ ± 2σ)
- Approximately 99.7% of the data falls within three standard deviations of the mean (μ ± 3σ)