题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093451-26159.png)
自2011-01-01到2014-03-01,邯郸共出现:多云
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093451-79723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093452-46976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093452-31280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093452-55434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093452-70967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093452-96427.png)
本市朱先生在雨雪天的情况下,分别以
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-24527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-51731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-92929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-25511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-84425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-90651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-63991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-68864.png)
(1)求他某天打出租上班的概率;
(2)将他每天上班所需的费用记为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-16348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-16348.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-40019.png)
解析
试题分析:(1)将事件“打出租车上班”分成两类:一类是雨雪天打出租车上班,另一类是非雨雪天打出租车上班,利用条件概率求各自的概率,并将两个概率相加即可得到问题中涉及的事件的概率;(2)列举出随机变量
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-16348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-16348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-16348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-16348.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093455-12052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093455-66579.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093455-29018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093455-85756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093456-20741.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-16348.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-84425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-51731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093454-63991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093453-92929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093456-57318.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093456-27501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093457-65397.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093457-95053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093457-39543.png)
![]() | ![]() | ![]() | ![]() | ![]() |
| ![]() | ![]() | ![]() | ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093458-81761.png)
核心考点
试题【从天气网查询到邯郸历史天气统计(2011-01-01到2014-03-01)资料如下:自2011-01-01到2014-03-01,邯郸共出现:多云天,晴天,雨】;主要考察你对用样本的频率分布估计总体分布等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093444-64660.png)
的数据(如下表),由最小二乘法求得回归直线方程
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093444-91901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093444-86676.png)
零件数![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
加工时间![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
A.
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093447-95067.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093447-29498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093447-23577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093447-36123.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093435-36768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093435-53740.png)
![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
空气质量 | 优 | 良 | 轻微污染 | 轻度污染 | 中度污染 | 中重度污染 | 重度污染 |
天数 | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() | ![]() |
(1)根据以上数据估计该城市这
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093435-36768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093435-53740.png)
(2)若该城市某企业因空气污染每天造成的经济损失
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093436-81462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093435-53740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093437-68868.png)
关系式为
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093437-56379.png)
若在本月
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093435-36768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093436-81462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093437-17548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093437-99404.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093428-24900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093428-87588.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093423-64417.png)
记
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093423-78117.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093423-25798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093424-62345.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093424-41725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093424-19084.png)
(1) 比较2012年上半年与下半年鲜蔬价格指数月平均值的大小(不要求计算过程);
(2) 直接写出从2012年2月到2013年1月的12个月中价格指数环比下降的月份.若从这12个月中随机选择连续的两个月进行观察,求所选两个月的价格指数都环比下降的概率;
(3)由图判断从哪个月开始连续三个月的价格指数方差最大.(结论不要求证明)
下表是测量数据的茎叶图:
规定:当产品中的此种元素含量
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093415-10983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093415-42693.png)
(1)试用上述样本数据估计甲,乙两地该产品的优质品率(优质品件数/总件数);
(2)从乙地抽出的上述10件产品中,随机抽取3件,求抽到的3件产品中优质品数
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093416-97721.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191026/20191026093416-48479.png)
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