• Welcome to the world's largest Chinese hacker forum

    Welcome to the world's largest Chinese hacker forum, our forum registration is open! You can now register for technical communication with us, this is a free and open to the world of the BBS, we founded the purpose for the study of network security, please don't release business of black/grey, or on the BBS posts, to seek help hacker if violations, we will permanently frozen your IP and account, thank you for your cooperation. Hacker attack and defense cracking or network Security

    business please click here: Creation Security  From CNHACKTEAM

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同比:本月高于去年的月份nlyzv3yhl4g3971.png

环比:本月高于本月ktebkqcza213972.png

统计学中的一些概念:

平均数

中位数

方差:总体方差,样本方差

几种分布:t分布,卡方分布,正态分布。

几种图形:直方图和点阵图。

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