二维随机向量(X,Y)服从分布N(μ,μ,σ^2,σ^2,0),则E[x*(y^2)]=?
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二维随机向量(X,Y)服从分布N(μ,μ,σ^2,σ^2,0),则E[x*(y^2)]=?
二维随机向量(X,Y)服从分布N(μ,μ,σ^2,σ^2,0),则E[x*(y^2)]=?
二维随机向量(X,Y)服从分布N(μ,μ,σ^2,σ^2,0),则E[x*(y^2)]=?
X,Y相互独立
所以EXY^2
=EX * EY^2
=EX * [(EX)^2+DX]
=μ(μ^2+σ^2)