已知数据
,
,…,
的平均数为2,方差为3,那么数据
,
,…,
的平均数和方差分别为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab84c3fe70da38ccb246fd4a71f9d86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e0df416994c88a649c78bb4b85bb40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329a13e040510a04e7c8a537ee44e532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4e2b8014a463e377e018ce37207ad3.png)
A.2,3 | B.7,6 | C.7,12 | D.4,12 |
20-21高一·全国·课后作业 查看更多[3]
更新时间:2021-11-21 20:05:30
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【推荐1】为了增加学生的锻炼机会,某中学决定每年举办一次足球和乒乓球比赛,据统计,近
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如果数据
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c58cc80f792a9262c4da33fabd21e95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8673f359b7a4b2cd12637d5dc3a46285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be82a7b31401023cda4703616f048df6.png)
A.11, 25 | B.11, 27 | C.8, 27 | D.11, 8 |
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【推荐1】甲、乙两名同学在5次体育测试中的成绩统计的茎叶图如图所示.若甲、乙两人的平均成绩分别是
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![](https://img.xkw.com/dksih/QBM/2020/9/19/2553100007743488/2555127737049088/STEM/38803dfd8435410bb597b28490dd8751.png?resizew=141)
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【推荐2】甲、乙两台机床生产同一种零件,根据两台机床每天生产零件的次品数,绘制了如下茎叶图,则下列判断错误的是( )
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C.甲的方差大于乙的方差 | D.甲的性能优于乙的性能 |
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