19-20高一·浙江杭州·期末
1 . 随机变量X的分布列如下:
其中a,b,c成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46eec99ba1a7f3e8f808c3c373fbd778.png)
_______ ,若
则方差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc23dc1709498e8920d7d243213190b2.png)
_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46eec99ba1a7f3e8f808c3c373fbd778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb87c1479b168d37a10e5c6be12909b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc23dc1709498e8920d7d243213190b2.png)
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2 . 若离散型随机变量
的分布列为:
则常数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
__________ ,
的数学期望![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
您最近一年使用:0次
2018-07-27更新
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218次组卷
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4卷引用:【新东方】杭州新东方高中数学试卷387
(已下线)【新东方】杭州新东方高中数学试卷387浙江省绍兴市2018届高三3月适应性模拟考试数学试题(已下线)2018年高考数学母题题源系列【浙江专版】专题七 随机变量的分布列、期望、方差浙江省温州市瑞安中学2020-2021学年高三上学期1月测试数学试题
3 . 王先生家住
小区,他工作在
科技园区,从家开车到公司上班路上有
两条路线(如图),
路线上有
三个路口,各路口遇到红灯的概率均为
;
路线上有
两个路口,各路口遇到红灯的概率依次为
,若走
路线,王先生最多遇到1次红灯的概率为__________ ;若走
路线,王先生遇到红灯次数
的数学期望为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532af83c6a8d570fbabd4dfa2c5c227b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fa157b4f65f3a9aa1f7f82de02e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04d468be20b4d43f5de75416de20e8ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0b1a9452e1c0020d72cb7a68be9717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://img.xkw.com/dksih/QBM/2017/8/22/1757580729794560/1758844986097664/STEM/04932f8e88b74ac0b91764fcf3aaf588.png?resizew=210)
您最近一年使用:0次
2017-08-24更新
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1482次组卷
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3卷引用:人教A版(2019) 必修第二册 第十章 概率 单元测试