在读 Data Analysis with Open Source Tools
If a distribution is symmetric and well behaved, then mean and median will be quite close together, and there is little difference in using either. Once the distribution becomes skewed, however, the basic assumption that underlies the mean as a measure or the location of the distribution is no longer fulfilled, and so you are better off using the median. (This is why the average wage is usually given in official publications as the median family income, not the mean; the latter would be significantly distorted by the few households with extremely high incomes.)引自 Only When Appropriate: Summary Statistics and Box Plots可是，亚洲某国从来都是用平均数说话的...