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%