解题方法
1 . 已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbff1eff55150d1e47a36f3fb93b386.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72d6c899d9ece423f5db1f2f529d16b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbbff1eff55150d1e47a36f3fb93b386.png)
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解题方法
2 . 已知随机变量
,
满足
且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8e18904de13e2ed10b5a5449bc7487.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec04ea8037e6a1f8059dec3c84ee340.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98e2396a644966ae9f0442a373d910a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f8e18904de13e2ed10b5a5449bc7487.png)
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2022-04-28更新
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3卷引用:重庆市渝东六校共同体2021-2022学年高二下学期联合诊断性测试数学试题
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3 . 已知离散型随机变量X的分布列如下表所示,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/223770da09feb2fc824764188e924d7e.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/223770da09feb2fc824764188e924d7e.png)
X | 1 | 2 | 3 |
P | 0.2 | a | 0.5 |
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3卷引用:重庆市江津第五中学校2022-2023学年高二(单招班)下学期期中数学试题
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4 . 已知5件产品中有3件合格品,2件不合格品,从中任取3件,记取出的不合格产品的件数为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e35f7cb3cdb98cf707cfadf0c83a04.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e35f7cb3cdb98cf707cfadf0c83a04.png)
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2020-08-16更新
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2卷引用:重庆市南开(融侨)中学2019-2020学年高二下学期期末数学试题
5 . 随机变量
的分布列如下:
若数学期望
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
__________ ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![]() | -2 | 0 | 2 |
![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be991f948d256139a5a1ee6dc11779b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
您最近一年使用:0次
2020-02-09更新
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2卷引用:重庆市九校联盟2019-2020学年高二上学期联考数学(理)试卷