1 . 从某企业生产的某种产品中抽取20件,测量这些产品的一项质量指标值,由测量得到如图1的频率分布直方图,从左到右各组的频数依次记为
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/ba67503a-e77f-4cfb-aaa5-37f8216d89f4.png?resizew=580)
(1)求图1中
的值;
(2)图2是统计图1中各组频数的一个算法流程图,求输出的结果
;
(3)从质量指标值分布在
、
的产品中随机抽取2件产品,求所抽取两件产品的质量指标值之差大于10的概率.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e47cd514b2920609e3781c87df6ab70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5002f030017f6f0b34a61b2e15c5a9cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/4/ba67503a-e77f-4cfb-aaa5-37f8216d89f4.png?resizew=580)
(1)求图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)图2是统计图1中各组频数的一个算法流程图,求输出的结果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)从质量指标值分布在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328fcb58a789bd05648864910ede4d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebdad92aa95a1d634b425a8e8c9f3f3.png)
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2016-12-03更新
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2卷引用:2015届广东省江门市高三3月模拟考试文科数学试卷