Jointly continuous PDF Proposition.For B C R2, P(X,I∈)=∥ fxr(x,y)dxdy (x,yEB The two-dimensional integral is over the subset B of R2 9Jointly continuous PDF • Proposition. 𝐹𝑜𝑟 𝐵 ⊂ 𝑅 2 , 𝑃 𝑋, 𝑌 ∈ 𝐵 = ඵ (𝑥,𝑦)∈𝐵 𝑓𝑋,𝑌 𝑥, 𝑦 𝑑𝑥𝑑𝑦 The two-dimensional integral is over the subset B of 𝑅 2 9