2 2
f(x,y) = C* exp-(2x + 8y ) -∞< x < ∞ , -∞< y < ∞
(a) C = ?
(b) P(Y>0|X > 1/2 ) = ?
(c) E[XY|Y=2] = ?
我只会算C= 4/π，请教(b) and (c)
(b) 的答案是 1/2
(c) 好像是0