21-22高二·全国·课后作业
1 . 已知某离散型随机变量
的均值
,
的分布列如下表:
则
______ ,
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d123c644bdc3953e33d9fb6b9580da94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
0 | 1 | 2 | 3 | |
P | a | b |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
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2022-03-08更新
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3卷引用:3.1 离散型随机变量的均值