名校
解题方法
1 . 设随机变量
可能的取值为1,2,3,4,
,又
的数学期望为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb2f87452a6a5fe9dd73766b16d66bf.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8331019abb141f862ee3f64d237849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834ba133848ef3bc0f9b1b2466caa64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb2f87452a6a5fe9dd73766b16d66bf.png)
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名校
2 . 已知随机变量
的概率分布为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/010924a0a60b9b270f82b8becc33a771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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名校
3 . 一个袋子中装有2个红球和3个白球,假设每个球被摸到的可能性是相等的.从袋子中摸出2个球,设拿出白球的个数为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284341eb43bbc1609922796f7f570bc6.png)
_______ ;![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d419c30ff40e9b368a3f151f639dac8f.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284341eb43bbc1609922796f7f570bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d419c30ff40e9b368a3f151f639dac8f.png)
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名校
解题方法
4 . 已知随机变量
的取值为
,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56d3c6256e17c9d4bbc44b2cfe8ae94.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bce9f696b2e58dbdf5e89f1b35e30b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f3980df4df293308601b6a1895d78b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006c079866a96892cf86597b47afad44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c56d3c6256e17c9d4bbc44b2cfe8ae94.png)
您最近一年使用:0次
2024-06-08更新
|
489次组卷
|
2卷引用:广东省深圳市福田区红岭中学2023-2024学年高二下学期期中考试数学试卷
解题方法
5 . 2024年“与辉同行”直播间开播,董宇辉领衔7位主播从“心”出发,其中男性5人,女性3人,现需排班晚8:00黄金档,随机抽取两人,则男生人数的期望为________ .
您最近一年使用:0次
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6 . 若
是离散型随机变量,
,
,又已知
,
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252f23a795cdb26a7bd20be0373556c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f12610f5e85900fdfb5043c93e68762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ab55c0f0699680dabc25016d8584a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213391a554d4dc7b6242a9c15c2db432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc6abf3f9b0ebcdc47a028c781b7edb9.png)
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7 . 随机变量
的取值为0,1,2,分布列如图:若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c0f363e40a7bcb1a705f74bf08e871.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006c079866a96892cf86597b47afad44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c0f363e40a7bcb1a705f74bf08e871.png)
![]() | 0 | 1 | 2 |
![]() | ![]() | ![]() | ![]() |
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8 . 随机变量X的分布列如下表,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab40fadc58e24cf88c93e52b289e9cc.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8155e53eaac51380f2da1eb259ec980a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab40fadc58e24cf88c93e52b289e9cc.png)
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名校
9 . 设随机变量X的概率分布为
(
,
),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02c6329fe51f660b20318d1b739d717.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7784e47dfa5e65d518ba880d6c9d86a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70bd59875d866b262054a5dc4d00611.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232d1ce3ad14256b1543e6007ff1675d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02c6329fe51f660b20318d1b739d717.png)
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10 . 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)
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