如何计算直方图的平均值和标准差简介：He never thought that his father was also a cruel person. He slapped the table, stood up and walked out. Strangely, as his father opened the door and went out, the sounds outside suddenly stopped.
He never thought that his father was also a cruel person. He slapped the table, stood up and walked out. Strangely, as his father opened the door and went out, the sounds outside suddenly stopped.
