1 . 某食品公司为了调查消费者对某款新食品的认可情况,随机抽取了100位消费者进行食品认可度(共设
,
,
,
四个等级)的调查,每位被调查的消费者均对该食品认可度等级进行了评定,调查的结果如下图(表):
![](https://img.xkw.com/dksih/QBM/2021/11/18/2856039445012480/2895562126778368/STEM/d6faa137-9bf9-456c-b466-342cb3716ab3.png?resizew=226)
男性消费者
(1)求
,
,
的值,并求被调查者中,认可度等级为
级的女性消费者人数;
(2)公司计划按性别采用分层抽样的方法从认可度等级为
级或
级的消费者中选取11人派送礼品,分别求被选中的男性消费者人数和女性消费者人数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2021/11/18/2856039445012480/2895562126778368/STEM/d6faa137-9bf9-456c-b466-342cb3716ab3.png?resizew=226)
男性消费者
认可度等级 | 频数 | 频率 |
![]() | 18 | 0.3 |
![]() | 24 | 0.4 |
![]() | ![]() | ![]() |
![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)公司计划按性别采用分层抽样的方法从认可度等级为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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