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按照GB/T 3358.1～3—1993《统计学术语》的有关规定,统计学符号一律采用斜体排印。常用:(1)样本的算术平均数用英文小写x或mean(中位数英文叙述中用M或median);(2)标准差用英文小写s或大写SD(限英
According to GB / T 3358.1 ~ 3-1993 “statistical terms” of the relevant provisions of statistical symbols shall be printed in italics. Commonly used: (1) the arithmetic mean of the sample is written in English lowercase x or mean (the median English description is M or median); (2) the standard deviation is written in lowercase s or uppercase SD