题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010444-14666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010444-35195.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010444-36572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-97150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-10276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-78340.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-66420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-87861.png)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-66467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-33228.png)
解析
试题分析:(1)先将从集合
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-97150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010444-36572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-78340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-10276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-66420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-87861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010445-66420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-87861.png)
试题解析:设事件
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-12494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010447-51122.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010447-43458.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010447-10906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010447-51122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010447-20534.png)
(1)基本事件共12个:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010448-63739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010448-31742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010448-56940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010448-33236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010449-19571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010449-79732.png)
事件
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-12494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-12494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-66467.png)
(2)试验的全部结果所构成的区域为
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010449-11395.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-12494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010449-32077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010446-33228.png)
考点:古典概型;几何概型
核心考点
试题【已知方程是关于的一元二次方程.(1)若是从集合四个数中任取的一个数,是从集合三个数中任取的一个数,求上述方程有实数根的概率;(2)若,,求上述方程有实数根的概率】;主要考察你对古典概型的概念及概率等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010425-32579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010425-23908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010425-94167.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010426-73561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010426-44217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010426-20515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010426-40329.png)
(1)求乙随机抽取的两张卡片的数字之和为奇数的概率;
(2)甲、乙分别取出一张卡,比较数字,数字大者获胜,求乙获胜的概率.
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010405-46591.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010405-94009.png)
(1)求直方图中
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010405-60060.png)
(2)求续驶里程在
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010405-99000.png)
(3)若从续驶里程在
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010405-99000.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010405-56474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010359-99790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010359-21172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010400-53368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010400-12368.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010400-91680.png)
(1)分别求第3,4,5组的频率。
(2)若从第3,4,5组中用分层抽样的方法抽取6名志愿者参与广场的宣传活动,应从第3,4,5组各抽取多少名志愿者.
(3)在(2)的条件下,该县决定在这6名志愿者中随机抽取2名志愿者介绍宣传经验,求第4组至少有一名志愿者被抽中的概率.
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027010400-59361.png)
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