求:(1)E(Y),D(X);(2)E(X+Y).

"> 求:(1)E(Y),D(X);(2)E(X+Y).

">

设二维随机变量(X,Y)的分布律为求:(1)E(Y),D(X);(2)E(X+Y).

设二维随机变量(X,Y)的分布律为求:(1)E(Y),D(X);(2)E(X+Y).

(1)1.2,0.24; (2)1.8

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