直方图的平均值和标准差怎么算简介：When he came outside the school gate, he saw Sun Ergou smiling and talking to Chen Man. The traffic policeman who had chased him earlier was not there. Chen Man must have used some means to drive the traffic policeman away!
When he came outside the school gate, he saw Sun Ergou smiling and talking to Chen Man. The traffic policeman who had chased him earlier was not there. Chen Man must have used some means to drive the traffic policeman away!
