名校
解题方法
1 . 已知随机变量
,且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f6fe700a3572142f5164e6aa47910c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11cc82d274c9500b258dc6310373b01c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c0f363e40a7bcb1a705f74bf08e871.png)
A.![]() | B.12 | C.![]() | D.24 |
您最近一年使用:0次
2022-07-09更新
|
584次组卷
|
5卷引用:重庆市第十八中学2022-2023学年高二下学期5月月考数学试题
2 . 下图是一块高尔顿板示意图:在一块木块上钉着若干排互相平行但相互错开的圆柱形小木钉,小木钉之间留有适当的空隙作为通道,前面挡有一块玻璃,将小球从顶端放入,小球在下落过程中,每次碰到小木钉后都等可能地向左或向右落下,最后落入底部的格子中,格子从左到右分别编号为
、
、
、
、
,用
表示小球最后落入格子的号码,则( )
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017494029811712/3018054219096064/STEM/b9c98468bbde40c1bf5bdc481421fc5c.png?resizew=110)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://img.xkw.com/dksih/QBM/2022/7/7/3017494029811712/3018054219096064/STEM/b9c98468bbde40c1bf5bdc481421fc5c.png?resizew=110)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
3 . 某群体中的每位成员使用移动支付的概率都为
,各成员的支付方式相互独立,设
为该群体的
位成员中使用移动支付的人数,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283c1a2e476936ea4afa9b353a593571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/865cabbc57f2fd6ec5ab68bb2c01f4e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df5be1440d099f464ef46dee39de6010.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2020-04-11更新
|
427次组卷
|
3卷引用:重庆市第十八中学2021-2022学年高二下学期期末数学试题