题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083944-73109.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
pk=
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083945-70323.png)
∴p0=
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083945-77368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083944-73109.png)
∴(1-p)4=
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083946-54999.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083945-74970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083944-86202.png)
∴p1=
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083946-75975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083944-86202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083945-74970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083945-70948.png)
核心考点
试题【[2014·四川模拟]在四次独立重复试验中,事件A在每次试验中出现的概率相同,若事件A至少发生一次的概率为,则事件A恰好发生一次的概率为( )A.B.C.D.】;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
(1)所选3人中女生人数为
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083938-65445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083938-65445.png)
(2)在男生甲被选中的情况下,求女生乙也被选中的概率.
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083925-89131.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083925-65034.png)
求甲在4局以内(含4局)赢得比赛的概率;
记
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083925-59337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083925-59337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083918-15695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083918-68429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083919-64161.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083904-61994.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027083904-61994.png)