Empirical Rule (68–95–99.7) Calculator

Empirical Rule (68-95-99.7) Calculator

Empirical Rule (68–95–99.7) Calculator

The Empirical Rule states that for a normal distribution:

  • About 68% of data lies within 1 standard deviation
  • About 95% of data lies within 2 standard deviations
  • About 99.7% of data lies within 3 standard deviations

Formula Used

Range = Mean ± (k × Standard Deviation)

Where:
k = 1 → 68%
k = 2 → 95%
k = 3 → 99.7%

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