1 . 某出租车公司响应国家节能减排的号召,已陆续购买了140辆纯电动汽车作为运营车辆,目前我国主流纯电动汽车按续驶里程数
(单位:公里)分为3类,即
,
,
.对这140辆车的行驶总里程进行统计,结果如下表:
![](https://img.xkw.com/dksih/QBM/2017/4/12/1664255912484864/1665028939735040/STEM/aaa481f8d43143f795dc95db5c2eecb6.png?resizew=592)
(1)从这140辆汽车中任取1辆,求该车行驶总里程超过5万公里的概率; (2)公司为了了解这些车的工作状况,决定抽取14辆车进行车况分析,按表中描述的六种情况进行分层抽样,设从
类车中抽取了
辆车. (ⅰ)求
的值; (ⅱ)如果从这
辆车中随机选取2辆车,求恰有1辆车行驶总里程超过5万公里的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1873a80473ad04ec4c9c33cece52f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e66f4549ee326e4ef373cf34a04ea90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55fb7aec83c7ea2bbe7f66a9b32c8c8f.png)
![](https://img.xkw.com/dksih/QBM/2017/4/12/1664255912484864/1665028939735040/STEM/aaa481f8d43143f795dc95db5c2eecb6.png?resizew=592)
(1)从这140辆汽车中任取1辆,求该车行驶总里程超过5万公里的概率; (2)公司为了了解这些车的工作状况,决定抽取14辆车进行车况分析,按表中描述的六种情况进行分层抽样,设从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2016-12-04更新
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6卷引用:2015-2016学年重庆八中高二暑期阶段测十数学(文)试卷