设随机变量X~B(3,0.4)且随机变量Y=X(3-X)/2,则P(Y=0)=___________
举一反三
- 设随机变量X和Y相互独立且都服从0-1分布:P{X= 0} =P{Y =0} = 2/3 ,P{X= 1} =P{Y =1} = 1/3 ,则P{X=Y}等于().
- 中国大学MOOC: 设X,Y为两个随机变量,且P{X ³0,Y ³ 0} = 3/7 , P{X ³ 0} = P{ Y ³ 0} = 4/7 ,则P{max(X, Y) ³ 0} = ( ).
- 设随机变量X ~ B(2,P), Y ~ B(3 ,P ),且 ,则 = 。2e162801c5ed06d656ed8f5f4f446b3e8a911306e4fe0d8ed9982a573eea3c96
- 设X,Y为两个随机变量,且P{X ³0,Y ³ 0} = 3/7 , P{X ³ 0} = P{ Y ³ 0} = 4/7 ,则P{max(X, Y) ³ 0} = ( ). A: 1/7 B: 3/7 C: 4/7 D: 5/7
- 设随机变量X、Y相互独立,且X~P(2),Y~P(3),a,b为常数,则E(aX+bY)= ,D(aX+bY)=