(1)故X的概率分布为
X
3
4
5
6
P
(2)
(1)X的可能取值为3,4,5,6,从而有:
P(X=3)=
=
,
P(X=4)=
=
,
P(X=5)=
=
,
P(X=6)=
=
.
故X的概率分布为
X
3
4
5
6
P
(2)P(X>4)=P(X=5)+P(X=6)=
=
.
(1)故X的概率分布为
X
3
4
5
6
P
(2)
(1)X的可能取值为3,4,5,6,从而有:
P(X=3)=
=
,
P(X=4)=
=
,
P(X=5)=
=
,
P(X=6)=
=
.
故X的概率分布为
X
3
4
5
6
P
(2)P(X>4)=P(X=5)+P(X=6)=
=
.