某抖音短视频发出后,前五天收到的网友留言条数分别是
,则该组数据的方差![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab4f3fe82a2da9fee7695cb90dc4946e.png)
______ ..
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e3ee1732f0b72a210f519a048d75d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab4f3fe82a2da9fee7695cb90dc4946e.png)
20-21高一下·浙江·期末 查看更多[2]
更新时间:2021-06-11 23:15:54
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【知识点】 计算几个数据的极差、方差、标准差
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【推荐2】已知一组数据
,
,…,
的方差是2,且
,则这组数据的平均数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24acc59e9b9aefe624f00d094e300b52.png)
___________ .
![](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/8c41d0144de4872289bf48a32363bf41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24acc59e9b9aefe624f00d094e300b52.png)
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