Revise-Marginal Probability ·P(X∈A)=P(X∈A,Y∈(-∞，∞) =∫rx妙r 0∞ The marginal PDF of X is 00 fx(x)=fx.v(x.y)dyRevise - Marginal Probability ◼ 𝑃 𝑋 ∈ 𝐴 = 𝑃 𝑋 ∈ 𝐴, 𝑌 ∈ −∞, ∞ = න 𝐴 න −∞ ∞ 𝑓𝑋,𝑌 𝑥, 𝑦 𝑑𝑦 𝑑𝑥 ◼ The marginal PDF of 𝑋 is 𝑓𝑋 𝑥 = න −∞ ∞ 𝑓𝑋,𝑌 𝑥, 𝑦 𝑑𝑦