题目3.(单选题)已知随机变量X~U(0,2),则Y=10-X,则()A. E(X)=2B. E(Y)=8C. D(X)=1D. (Y)=1/33.(单选题)已知随机变量X~U(0,2),则Y=10-X,则()A. E(X)=2B. E(Y)=8C. D(X)=1D. (Y)=1/3题目解答答案D. (Y)=1/3