2.22 已知离散型随机变量ξ的分布列为-|||-ξ -2 -1 0 1 3-|||-P dfrac (1)(5) dfrac (1)(6) dfrac (1)(5) dfrac (1)(15) dfrac (11)(30)-|||-求 =(5)^2 的分布列.

已知离散型随机变量X的分布律如下.-|||-x -2 -1 0 1 3-|||-p dfrac (1)(5) dfrac (1)(6) dfrac (1)(5)

【题文】设离散型随机变量X的分布列为: X -1 0 1 2 3 P dfrac (1)(10) dfrac

设随机变量X的分布律为X -1 0 1-|||-P dfrac (1)(5) dfrac (3)(5) dfrac (1)(5)设X -1 0 1-|||-P

. . 0 1 3-|||-p .dfrac (1)(5) .dfrac (1)(6) dfrac (1)(5) .dfrac (1)(15) dfrac (1

. . 0 1 3-|||-p .dfrac (1)(5) .dfrac (1)(6) dfrac (1)(5) .dfrac (1)(15) dfrac (1

5.设二维离散型随机变量(X,Y)的联合分布律如下.-|||-2 3-|||-X-|||-1 dfrac (1)(6) dfrac (1)(9) dfrac (

设随机变量X,Y满足P(XY=0) =1,并且分布律分别为X -1 0 2 Y 0 1-|||-P dfrac (1)(6) dfrac (1)(3) dfra

随机变量(X,Y)的联合分布律如下表1.1X⊥Y 1 2 3-|||-dfrac (1)(27)-|||-dfrac (5)(27)-|||-dfrac (7)

2.5 已知离散型随机变量X的分布律为 X=k =(p)^k+1(k=0,1), 则 p= ()-|||-(A) dfrac (sqrt {5)-1}(2)

已知随机变量X的分布律为-|||-x 2 3 4 9-|||-p dfrac (1)(8) dfrac (5)(8) dfrac (1)(8) dfrac (1