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The normal (Gaussian) distribution is the most important probability distribution in statistics — bell-shaped, symmetric around the mean. The central limit theorem ensures many real phenomena approach normality with large samples.

Trin-for-trin guide

1. 1PDF: f(x) = (1/σ√2π) × e^(−(x−μ)²/2σ²)
2. 268-95-99.7 rule: 68% within 1σ, 95.4% within 2σ, 99.7% within 3σ
3. 3CDF gives P(X ≤ x) — area under the curve to the left of x

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