为什么中位数比平均数大

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(718096,1069956,2640124,1091338,1903744,1304848,1053404,2255285,2737882,2722683,1413186,1826656,1130342,179401,1049510,1122364,3337949,1877359,1863231,154770,1121366,802205,1345646,1109324,138562,156260,3163755,1114478,110583,2890547) ORDER BY field (ArticleID,718096,1069956,2640124,1091338,1903744,1304848,1053404,2255285,2737882,2722683,1413186,1826656,1130342,179401,1049510,1122364,3337949,1877359,1863231,154770,1121366,802205,1345646,1109324,138562,156260,3163755,1114478,110583,2890547)