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The mean is the most commonly used statistical indicator to reflect the central tendency of data distribution, in this study, the mean was reclassified according to whether the effect of extreme value was considered or not. According to the definition and specific classification of mean value, We explain in detail how to calculate the normal mean by ways of "built-in function", "pivot table chart" and "descriptive statistics", symmetry trim mean by TRIMMEAN function and asymmetrical trim meandoi:10.17706/ijcce.2020.9.3.141-148 fatcat:7gktme5ehfaypnqz43peqmyxhy