名校
解题方法
1 . 给出下列结论:①一组数据
的第
百分位数为
;②若随机变量
,且
,则
;③若将一组数据中的每一个数都加上同一个正数
,则其平均数和方差都会发生变化.其中正确说法的序号为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bdb1faf12a59889ef07f9aa0e2c2b3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c748e40ba21ac5063d3bccaa57ef278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7795348ccc99540240f53b5d81a3333.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d387ddc97b98af79ddf82cde8f4852b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66161fc8faea9eb09485adafcb5add5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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