1 . 某商场对甲、乙两种品牌的牛奶进行为期100天的营销活动,为调查这100天的日销售情况,用简单随机抽样抽取10天进行统计,以它们的销售数量(单位:件)作为样本,样本数据的茎叶图如图.已知该样本中,甲品牌牛奶销量的平均数为48件,乙品牌牛奶销量的中位数为43件,将日销量不低于50件的日期称为“畅销日”.
(1)求出
,
的值;
(2)以10天的销量为样本,估计100天的销量,请完成这两种品牌100天销量的
列联表,并判断是否有
的把握认为品牌与“畅销日”天数相关.
![](https://img.xkw.com/dksih/QBM/2017/1/23/1619471834259456/1619471834734592/STEM/e4608d1b-8434-470c-a09f-39c8fbacba1d.png)
![](https://img.xkw.com/dksih/QBM/2017/1/23/1619471834259456/1619471834734592/STEM/13763afc-c916-4227-9f72-c8c12eafcfae.png)
附:
(其中
为样本容量)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)以10天的销量为样本,估计100天的销量,请完成这两种品牌100天销量的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95c487ba8259608d3cb24fb594ffbd7b.png)
![](https://img.xkw.com/dksih/QBM/2017/1/23/1619471834259456/1619471834734592/STEM/e4608d1b-8434-470c-a09f-39c8fbacba1d.png)
![](https://img.xkw.com/dksih/QBM/2017/1/23/1619471834259456/1619471834734592/STEM/13763afc-c916-4227-9f72-c8c12eafcfae.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b2f70b01e964f4084816bd12125b714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/356b05e46b10ee51c3e43546d73ec96c.png)
0.050 | 0.010 | 0.001 | |
3.841 | 6.635 | 10.828 |
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2017-02-08更新
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3卷引用:2017届四川双流中学高三文必得分训练4数学试卷