设随机变量X,Y相互独立,X~U(0,2),Y~E(1),则.P(X+Y>1)等于().
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设x 为随机变量,且 P (X≤10) =0.3,P(X>30) =0.4,则 P (10 A. 0. 1 B. 0. 2C.0. 3 D. 0. 4
设Z为随机变量,且P(X≤15)=0.3,P (X>20) =0.4,则P(15 A. 0. 1 B. 0.2 C. 0.3 D. 0.4
设随机变量X~P(λ),且E[(X-1)(X-2)]=1,则λ=_______.
设随机变量X~N(0,σ^2),Y~N(0,4σ^2),且P(X≤1,y≤-2)=,则P(X>1,Y>-2)=_______.
设随机变量X满足|X|≤1,且P(X=-1)=,P(X=1)=,在{-1 (1)求X的分布函数;(2)求P(X
设 X 为随机变量,且 P( X ≤2) =0.7,P(X>2) =0.1,则 P(X〈-2)= ( )。A. 0. 1B. 0. 2 C. 0.3 D. 0.4