设X~B(10,0.2),Y~B(20,0.2),且X与Y相互独立,则X+Y~ ( )
A: B(30,0.2)
B: B(20,0.4)
C: B(30,0.4)
D: B(20,0.2)
A: B(30,0.2)
B: B(20,0.4)
C: B(30,0.4)
D: B(20,0.2)
举一反三
- 设随机变量X~B(4, 0.2),Y ~B(2, 0.2),且X与Y相互独立,则X+Y服从_______
- 设X~N(0,1),Y~N(1,1)且X,Y相互独立,则P{X+Y[img=14x21]1803194f2a54b35.png[/img]1}= . A: 0.2 B: 0.3 C: 0.4 D: 0.5
- 设X~N(0,1),Y~N(1,1)且X,Y相互独立,则P{X+Y[img=14x21]1803aac11e44296.png[/img]1}= . A: 0.2 B: 0.3 C: 0.4 D: 0.5
- 设X~N(0,1),Y~N(1,1)且X,Y相互独立,则P{X+Y[img=14x21]1803dfec554c554.png[/img]1}= . A: 0.2 B: 0.3 C: 0.4 D: 0.5
- 若X~P(0.2),Y~P(0.3),且X与Y相互独立,则X+Y~