设
,则
,
,
,
的极差是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada5e0f6acc0871207e3e4f28988b129.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73223351668b7c42be517f51fd9fec94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5d7130f678bb4b096f4ee9648f3c90d.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
更新时间:2024-05-17 15:55:59
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解题方法
【推荐2】
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f076db5dadd8f5feb7b11155e1d3cee.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】已知样本数据
,
,
,
,
,该样本平均数为4,方差为2,现加入一个数4,得到新样本的平均数为
,方差为
,则( )
![](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/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365b38a7689a8eede6820cd6f1fe952b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9b42973c53907f09f2de384c42fc5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
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(0.94)
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【推荐2】某样本中共有
个个体,其中四个值分别为
,第五个值丢失,但该样本的平均数为
,则样本方差为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c91c0bb8060d1b19ae871e7cb11f6ff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次