名校
解题方法
1 . 已知
,且
,记随机变量X为x,y,z中的最小值,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b9249c10ae3896e2ee96bfa1a153e5.png)
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe0b46982da384c26db4c2b05435b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4180425c618f82e01c3c01e4f5c256bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b9249c10ae3896e2ee96bfa1a153e5.png)
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2 . 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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解题方法
3 . 随机变量X满足
,则随机变量X的期望![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc47f3b70b4cfa3317e8320eff66b710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac87b4bd71432d757c7b78bbd6b2dcfd.png)
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4 . 已知随机变量X的分布列表如下表,且随机变量
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a874feda9583d7ebbcad739022db93f1.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e1d3df6bb1d9395c1a9b3627e365d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a874feda9583d7ebbcad739022db93f1.png)
X | -1 | 0 | 1 |
m |
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5 . 设
为随机变量,从棱长为1的正方体的12条棱中任取两条,当两条棱相交时,
;当两条棱平行时,
的值为两条棱之间的距离;当两条棱异面时,
为两条棱上两点(不在同一条棱上)间距离的最小值,则随机变量
的所有可能取值有__________ ,
的数学期望为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1317f8d562994833f26f0a2638cf19cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
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解题方法
6 . 已知随机变量X的分布列为
设
,则
等于_________ .
X | 0 | 1 | 2 |
P |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2e03739ad512e233035ce8d39c8d56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbf74fc4ba610d6c4b2283c1cc3a24d.png)
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2024高三·全国·专题练习
7 . 随机变量
的取值为0,1,2,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/bee34b3a20729a3db8bf4da2c268f314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006c079866a96892cf86597b47afad44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c0f363e40a7bcb1a705f74bf08e871.png)
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8 . 从某班6名学生,其中男生4人,女生2人中任选3人参加活动,设所选3人中女生人数为X,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbae4dcf2707f47fcd52377c4f26af0.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbae4dcf2707f47fcd52377c4f26af0.png)
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9 . 抛掷一颗质地均匀的骰子,设
表示掷出的点数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd353481279871d4c18541586c319c8d.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd353481279871d4c18541586c319c8d.png)
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10 . 设随机变量
的分布
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0307f4a18374a278af8e3a588db2861e.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b164b48c9870880f1e7ce0eca6ada7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0307f4a18374a278af8e3a588db2861e.png)
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2024-05-09更新
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122次组卷
|
2卷引用:上海市高桥中学2023-2024学年高二下学期期中考试数学试卷