Empirical Rule Calculator
Calculate the percentage of data within 1, 2, and 3 standard deviations of the mean using the Empirical Rule (68-95-99.7 Rule).
Empirical Rule:
- ≈68% of data within 1σ of mean
- ≈95% of data within 2σ of mean
- ≈99.7% of data within 3σ of mean
Formula: For a normal distribution, probabilities for intervals:
1σ interval: μ ± σ 2σ interval: μ ± 2σ 3σ interval: μ ± 3σ