概率论与数理统计第二版课后答案科学出版社王(6)

P(X=2)=1 0.6 0.1=0.3

所以X的分布律为

XP

X的分布函数为

10.6

20.3

30.1

x<1 0

0.61≤x<2

F(x)=

0.92≤x<3 1x≥3

2.20(1)

π

P{Y=0}=P{X==0.2

2

P{Y=π2}=P{X=0}+P{X=π}=0.3+0.4=0.7

3π

P{Y=4π2}=P{X==0.1

2

Y00.2

π20.7

4π20.1

qi(2)

P{Y= 1}=P{X=0}+P{X=π}=0.3+0.4=0.7

π3π

P{Y=1}=P{X=+P{X==0.2+0.1=0.3

22Y

-10.7

10.3

qi