若随机变量
的分布列为
则当
时,实数
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
0 | 1 | 2 | 3 | |||
0.1 | 0.2 | 0.2 | 0.3 | 0.1 | 0.1 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6279a12fc76cad521e2960d3df8b4098.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2024-05-10 00:25:09
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【知识点】 利用随机变量分布列的性质解题解读
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【推荐1】已知离散型随机变量
的分布列如下表.若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_____________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb275e5ed5be135c69464591a5c77d63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dfa24202d0da15f4683ca9e279e58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
0 | 1 | 2 | ||
a | b | c |
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解题方法
【推荐2】已知随机变量ξ只能取三个值:
,
,
,其概率依次成等差数列,则公差d的取值范围是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
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