题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085859-54397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085900-68830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085900-14531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085900-26179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085900-80695.png)
A.P | B.2P(1-P) | C.-P(1-P) | D.P(1-P) |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085901-19130.png)
核心考点
试题【设随机试验的结果只有A与,,令随机变量 则的方差为( )A.PB.2P(1-P)C.-P(1-P) D.P(1-P)】;主要考察你对离散型随机变量及其分布列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085853-54884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085853-54884.png)
A.2 | B.3 | C. 4 | D.5 |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027085843-92668.png)
则X的数学期望是( )
A.P | B.2P(1-P) | C.-P(1-P) | D.P(1-P) |
A.2 | B.3 | C. 4 | D.5 |