1 . 为了检测某轮胎公司生产的轮胎的宽度,需要抽检一批轮胎(共10个轮胎),已知这批轮胎宽度(单位:
)的折线图如下图所示:
![](https://img.xkw.com/dksih/QBM/2017/12/1/1829318069592064/1832145485594624/STEM/ce1e18b5319640fbaa8fa3b44bb09596.png?resizew=271)
(1)求这批轮胎宽度的平均值;
(2)现将这批轮胎送去质检部进行抽检,抽检方案是:从这批轮胎中任取5个作检验,这5个轮胎的宽度都在
内,则称这批轮胎合格,如果抽检不合格,就要重新再抽检一次,若还是不合格,这批轮胎就认定不合格.
求这批轮胎第一次抽检就合格的概率;
记
为这批轮胎的抽检次数,求
的分布列及数学期望.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9c214cc074cf24aa90f2dfb01de102a.png)
![](https://img.xkw.com/dksih/QBM/2017/12/1/1829318069592064/1832145485594624/STEM/ce1e18b5319640fbaa8fa3b44bb09596.png?resizew=271)
(1)求这批轮胎宽度的平均值;
(2)现将这批轮胎送去质检部进行抽检,抽检方案是:从这批轮胎中任取5个作检验,这5个轮胎的宽度都在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bb8a75f175abf6103578f828f2bb7a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62d82123c9bec7eb31f00b065f9d297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f375a95a73432cc9406e70cda0e9c636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
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2017-12-05更新
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2卷引用:广西贺州市桂梧高中2018届高三上学期第四次联考数学(理)试题