Problem Statement
By the empirical (68–95–99.7) rule for a normal distribution, approximately what percent of observations lie within 2 standard deviations of the mean?
Explanation
Empirical rule: ~68% within 1σ, ~95% within 2σ, ~99.7% within 3σ.
Code Solution
SolutionRead Only
≈95% within ±2σ
