.某一离散型随机变量ξ的概率分布列如下表:且Eξ= 1.5,则a – b的值
ξ |
0 |
1 |
2 |
3 |
P |
0.1 |
a |
b |
0.1 |
A.–0.1 | B.0 | C.0.1 | D.0.2 |
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.某一离散型随机变量ξ的概率分布列如下表:且Eξ= 1.5,则a – b的值
ξ |
0 |
1 |
2 |
3 |
P |
0.1 |
a |
b |
0.1 |
A.–0.1 | B.0 | C.0.1 | D.0.2 |