1 . 近几年骑车锻炼越来越受到人们的喜爱,男女老少踊跃参加,我校课外活动小组利用春节放假时间进行社会实践,对
年龄段的人群随机抽取
人进行了一次“你是否喜欢骑车锻炼”的问卷,将被调查人员分为“喜欢骑车”和“不喜欢骑车”,得到如下统计表和各年龄段人数频率分布直方图:
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634104832/STEM/e946bbc642634b4aba654d4913908a94.png)
(1)补全频率分布直方图,并
的值;
(2)从
岁年龄段的“喜欢骑车”中采用分层抽样法抽取6人参加骑车锻炼体验活动,求其中选取2名领队来自同一组的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f216d9300fc6a66a5fb3a4a3c01112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634104832/STEM/e946bbc642634b4aba654d4913908a94.png)
(1)补全频率分布直方图,并
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634104832/STEM/95299bfbfdcc4e6f958b9b2cbcc38fc9.png)
(2)从
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634104832/STEM/5e01b10747c94a248105083171ff2ace.png)
![](https://img.xkw.com/dksih/QBM/2016/9/5/1572994627854336/1572994634104832/STEM/b5acb93b765e4f728896a7f8eb84efcf.png)
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2016-12-04更新
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274次组卷
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2卷引用:2016届山西右玉一中高三下学期模拟考试数学(文)试卷