题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181556-87501.png)
(1)从区间
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181556-65228.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181556-72378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-85993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-26221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-96412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-85993.png)
(2)若连续掷两次骰子(骰子六个面上标注的点数分别为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-50831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181556-72378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-47318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-51864.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-64161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181558-18667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181558-73252.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181558-28157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181558-79836.png)
解析
试题分析:(1)根据函数
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-26221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-96412.png)
得知
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181559-90493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181559-37465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181559-74660.png)
由不等式组
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181600-84868.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181600-96783.png)
(2)应用基本不等式得到
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181600-15326.png)
由于
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181600-12727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181601-57305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181601-10893.png)
讨论当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181601-55848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181601-18742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181602-23871.png)
得到满足条件的基本事件个数,而基本事件总数为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181602-12251.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181602-56733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-26221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181557-96412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181602-22714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181603-93505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181559-90493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181559-37465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181559-74660.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181603-81168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181600-96783.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181603-10215.png)
(2)由已知:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181604-58734.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181604-53547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181600-15326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181604-86208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181602-56733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181600-12727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181601-57305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181604-74955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-49959.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181601-55848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-49959.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181601-18742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-22274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-49959.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181602-23871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-91824.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-49959.png)
满足
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181605-49959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181606-91201.png)
而基本事件总数为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181602-12251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181606-30942.png)
核心考点
试题【已知函数.(1)从区间内任取一个实数,设事件={函数在区间上有两个不同的零点},求事件发生的概率;(2)若连续掷两次骰子(骰子六个面上标注的点数分别为)得到的点】;主要考察你对随机事件的概率等知识点的理解。[详细]
举一反三
(1)根据以上数据建立一个
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181549-50673.png)
(2)试判断是否有95%的把握认为是否晕机与性别有关?
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181549-24019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181549-28431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181549-21722.png)
P(K2≥k0) | 0.50 | 0.40 | 0.25 | 0.15 | 0.10 | 0.05 | 0.025 | 0.010 | 0.005 | 0.001 |
k0 | 0.455 | 0.708 | 1.323 | 2.072 | 2.706 | 3.841 | 5.024 | 6.635 | 7.879 | 10.828 |
求乙在每局中获胜的概率为多少?
假设比赛进行到有一人比对方多2分或打满6局时停止,用
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181539-84307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181539-84307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181540-55405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181531-50220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181532-48360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181532-47236.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181448-49341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181448-57875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181448-49341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181433-67485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-56963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-25201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-47899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-68134.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181435-57729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181435-70982.png)
(1)请直接回答这种抽样方法是什么抽样方法?并估计出这40辆车速的中位数;
(2)设车速在
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-56963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181435-13377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181435-79531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181436-27270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181436-87404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-56963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-25201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181436-31459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181437-37263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181437-20356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181437-42336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-25201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181438-86745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181438-58286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181438-58286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181434-25201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026181438-34064.png)
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