题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120049-92493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120050-85497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120050-94561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120050-97156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-93649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-54009.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-96466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-83637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-83637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120049-92493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-59430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120052-58006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120052-55516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120052-53403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-93649.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120052-36048.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120053-62958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120053-54975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120052-55516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120053-68743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120050-94561.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120053-47151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120053-62958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120054-45318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120054-39261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120051-93649.png)
分组 | 频数 | 频率 |
![]() | ![]() | ![]() |
![]() | ![]() | ![]() |
![]() | ![]() | ![]() |
![]() | ![]() | ![]() |
![]() | ![]() | ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120057-16099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-91597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120057-64521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-59082.png)
(2)根据上述频率分布表,画出样本频率分布直方图;
(3)根据样本频率分布直方图,求在该厂任取
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-58629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-85247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120055-76201.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120059-13092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120059-55096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120059-68884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120059-62522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120100-13103.png)
解析
试题分析:(1)根据题干中的数据以及频率分布表中的信息求出
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120057-16099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-91597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120057-64521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-59082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120100-24401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-58629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120055-76201.png)
试题解析:(1)由题意知
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120059-13092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120059-55096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120100-15926.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120100-39151.png)
(2)样本频率分布直方图为:
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120101-77359.png)
(3)根据样本频率分布直方图,每人的日加工零件数落在区间
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120055-76201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120101-60902.png)
设所取的
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-58629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120055-76201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120101-97895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120101-24511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120102-96220.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-58629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120058-85247.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120102-37157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027120100-13103.png)
【考点定位】本题考查频率分布直方图以及独立性重复试验,考查频率分布直方图的绘制与应用,以及解决相关事件概率的计算,属于中等题.
核心考点
试题【随机观测生产某种零件的某工厂名工人的日加工零件数(单位:件),获得数据如下:、、、、、、、、、、、、、、、、、、、、、、、、,根据上述数据得到样本的频率分布表如】;主要考察你对独立重复试验等知识点的理解。[详细]
举一反三
乒乓球台面被球网分成甲、乙两部分,如图,
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115936-37761.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-57333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-58581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-57678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-23533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115938-57940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-57678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115938-44740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-23533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115938-74794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115938-81866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-57678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115939-75542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-23533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115939-64199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115937-57333.png)
(Ⅰ)小明的两次回球的落点中恰有一次的落点在乙上的概率;
(Ⅱ)两次回球结束后,小明得分之和
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115939-87317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115924-24280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115925-26030.png)
(1)设每盘游戏获得的分数为
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115925-72852.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115925-72852.png)
(2)玩三盘游戏,至少有一盘出现音乐的概率是多少?
(3)玩过这款游戏的许多人都发现,若干盘游戏后,与最初的分数相比,分数没有增加反而减少了.请运用概率统计的相关知识分析分数减少的原因.
(1)求同一工作日至少3人需使用设备的概率;
(2)实验室计划购买k台设备供甲、乙、丙、丁使用,若要求“同一工作日需使用设备的人数大于k”的概率小于0.1,求k的最小值.
| 关注NBA | 不关注NBA | 合计 |
男生 | | 6 | |
女生 | 10 | | |
合计 | | | 48 |
已知在全班48人中随机抽取1人,抽到关注NBA的学生的概率为
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115817-99949.png)
(1)请将上面的表补充完整(不用写计算过程),并判断是否有95%的把握认为关注NBA与性别有关?说明你的理由;
(2)设甲,乙是不关注NBA的6名男生中的两人,丙,丁,戊是关注NBA的10名女生中的3人,从这5人中选取2人进行调查,求:甲,乙至少有一人被选中的概率.
答题参考
P(K2≥k) | 0.10 | 0.05 | 0.010 | 0.005 |
k0 | 2.706 | 3.841 | 6.635 | 7.879 |
![](http://img.shitiku.com.cn/uploads/allimg/20191027/20191027115817-97396.png)
(1)根据所给样本数据完成下面2×2列联表;
(2)请问能有多大把握认为药物有效?
| 不得禽流感 | 得禽流感 | 总计 |
服药 | | | |
不服药 | | | |
总计 | | | |
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