直方图的平均值和标准差怎么算

简介：Su Can then said calmly: I always like to convince people with virtue. I really don’t understand anything. Don’t you understand everything? Then let me ask you, do you know Ptolemy's theorem and Heron's formula? Do you know several variations of Jeanson's inequality and Cauchy's inequality? Do you understand the Big and Little Fermat Theorems in number theory?