共有9个基本事件,
玩家甲胜玩家乙的基本事件分别是:(石头,剪刀);(剪刀,布);(布,石头),共有3个.
所以,在1次游戏中玩家甲胜玩家乙的概率P=
| 3 |
| 9 |
| 1 |
| 3 |
(Ⅱ)X的可能取值分别为0,1,2,3.
P(X=0)=
| C | 03 |
| 2 |
| 3 |
| 8 |
| 27 |
| C | 13 |
| 1 |
| 3 |
| 2 |
| 3 |
| 12 |
| 27 |
| C | 23 |
| 1 |
| 3 |
| 2 |
| 3 |
| 6 |
| 27 |
| C | 33 |
| 1 |
| 3 |
| 1 |
| 27 |
X的分布列如下:
| X | 0 | 1 | 2 | 3 | ||||||||
| P |
|
|
|
|
| 8 |
| 27 |
| 12 |
| 27 |
| 6 |
| 27 |
| 1 |
| 27 |
| 3 |
| 9 |
| 1 |
| 3 |
| C | 03 |
| 2 |
| 3 |
| 8 |
| 27 |
| C | 13 |
| 1 |
| 3 |
| 2 |
| 3 |
| 12 |
| 27 |
| C | 23 |
| 1 |
| 3 |
| 2 |
| 3 |
| 6 |
| 27 |
| C | 33 |
| 1 |
| 3 |
| 1 |
| 27 |
| X | 0 | 1 | 2 | 3 | ||||||||
| P |
|
|
|
|
| 8 |
| 27 |
| 12 |
| 27 |
| 6 |
| 27 |
| 1 |
| 27 |