题目
题型:江苏模拟难度:来源:
1 |
2 |
(1)求ξ的分布列及数学期望;
(2)在概率P(ξ=i)(i=0,1,2,3)中,若P(ξ=1)的值最大,求实数a的取值范围.
答案
C | 01 |
1 |
2 |
C | 02 |
1 |
2 |
C | 11 |
1 |
2 |
C | 02 |
C | 01 |
1 |
2 |
C | 12 |
1 |
2 |
C | 11 |
1 |
2 |
C | 12 |
C | 01 |
1 |
2 |
C | 22 |
1 |
2 |
C | 11 |
1 |
2 |
C | 22 |
a2 |
2 |
所以ξ的分布列为
1 |
2 |
C | 01 |
1 |
2 |
C | 02 |
1 |
2 |
C | 11 |
1 |
2 |
C | 02 |
C | 01 |
1 |
2 |
C | 12 |
1 |
2 |
C | 11 |
1 |
2 |
C | 12 |
C | 01 |
1 |
2 |
C | 22 |
1 |
2 |
C | 11 |
1 |
2 |
C | 22 |
a2 |
2 |