解题方法
1 . 已知数据
,
,…,
的平均数为
,方差为
,数据
,
,
,…,
的平均数为
,方差为
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95cdcfc1fabb47abf27cf7fb19587146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3282e5fde4ae53fcb1bb072a685304c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a219c950d45cf8de7191d32bde3211e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b5d5df229b4bd36cf5a1f1c218efb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b96e2b7111d8ca9623e40a50cc7c1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb161d863b8d35f71c685760ba5d0dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/848dac3d6db7c23c58f399970b3f9b18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbc29b47b83fdc5368770b7b1acb439.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
解题方法
2 . 若数据
的方差为9,则数据
的方差为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78589361bfef5afd99c0ed84bc359a43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ea0ce2c7f77c3cbb97dd399518ff96.png)
您最近一年使用:0次
2021-08-02更新
|
233次组卷
|
2卷引用:江苏省泰州市2020-2021学年高一下学期期末数学试题