题目内容:
下列( )可以作为离散型随机变量的分布列. A.
X=Xi | -1 | 0 | 1 |
Pi | 1/4 | 1/4 | 1/4 |
B.
Y=Yi | 0 | 1 | 2 |
Pi | -1/4 | 3/4 | 1 |
C.
Z=Zi | 0 | 1 | 2 |
Pi | 1/5 | 0 | 3/5 |
D.
X=Xi | 1 | 2 | 3 |
Pi | 1/3 | 1/3 | 1/3 |
参考答案:
答案解析:
X=Xi | -1 | 0 | 1 |
Pi | 1/4 | 1/4 | 1/4 |
Y=Yi | 0 | 1 | 2 |
Pi | -1/4 | 3/4 | 1 |
Z=Zi | 0 | 1 | 2 |
Pi | 1/5 | 0 | 3/5 |
X=Xi | 1 | 2 | 3 |
Pi | 1/3 | 1/3 | 1/3 |