Revise-Marginal Probability ·P(X∈A)=P(X∈A,Y∈(-∞，∞) =∫Ck0r 00 The marginal PDF of X is 00 fx(x)=fx.r(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