题目3.设 approx N(0,(4)^2), approx N(1,(3)^2), 且 (rho )_(x)=-dfrac (1)(2), 令 =dfrac (x)(2)+dfrac (y)(3), 求-|||-(1)EZ,DZ;(2)X与Z的相关系数ρg;(3)X与Z是否相互独立?题目解答答案
