题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021646-71453.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-33203.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021646-71453.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-33203.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021646-71453.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-33203.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021646-71453.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-33203.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-22489.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-27134.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-12336.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021646-71453.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-33203.gif)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-43137.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021647-89850.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021648-42786.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021648-22189.gif)
甲获胜有以下情形:
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021648-96178.gif)
则甲获胜的概率为
![](http://img.shitiku.com.cn/uploads/allimg/20191030/20191030021648-91262.gif)
核心考点
试题【(本题满分13分)用一枚质地均匀的硬币,甲、乙两人做抛掷硬币游戏,甲抛掷4次,记正面朝上的次为;乙抛掷3次,记正面朝上的次为.(Ⅰ)分别求和的期望;(Ⅱ)规定:】;主要考察你对离散型随机变量均值与方差等知识点的理解。[详细]
举一反三
(1)求当m=3时,一个小组经过一次检验就能确定化验结果的概率是多少?
(2)试比较在第二种方法中,m=4和m=6哪种分组方法所需要的化验次数更少一些?
ε | 1 | 3 | 5 |
p | 0.5 | 0.3 | 0.2 |
A.1 | B.![]() | C.4.5 | D.2.4 |
A.20 | B.10 | C.5 | D.15 |