某一随机变量
的概率分布列如表,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd23135c258f51710d8f15ddd97b428f.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42131f7575ef4427a382774db88d144e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd23135c258f51710d8f15ddd97b428f.png)
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更新时间:2021-09-08 20:08:08
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【推荐1】设随机变量
的概率分布如下:
则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaab6cffb0cbdf45605daf80ccfa25f2.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![]() | 1 | 2 | 3 | 4 |
![]() | ![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaab6cffb0cbdf45605daf80ccfa25f2.png)
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真题
【推荐2】随机变量
的分布列如下:
其中
成等差数列,若
,则
的值是_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ace74bfb716753490ebe0e740ff5baa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa78d1ebb0c865e9025d728ab454aabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e006432be27a365b8ea6f1c4f835cbdb.png)
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解题方法
【推荐1】一个盒子中装有六张卡片,上面分别写着如下六个定义域为
的函数:
,
,
,
,
,
.现从盒子中逐一抽取卡片,且每次抽出后均不放回,若取到一张写有偶函数的卡片则停止抽取,否则继续进行,设抽取次数为
,则
的概率为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e00b49aa78de649f34d8bb9d5179ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736e6a8b3201d57d57d5ccd9613664d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8903ac5086196623b012db50975c4fbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc86b91c743aac8abfc66157d0a5400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983dec5a0bd04b069ab72730db629be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ad790e7db38c39456e84209affb4b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2dfc469d7a6cf70478652b4596b9c6.png)
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解题方法
【推荐2】袋中有4只红球3只黑球,从袋中任取4只球,取到1只红球得1分,取到1只黑球得3分,设得分为随机变量ξ,则P(ξ≤6)=________ .
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