算平均数为什么去掉最高和最低分

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select * from tbl_Articles WHERE ArticleID=3206795 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=3206795 LIMIT 0,1
select * from tbl_Articles_sphinx where id=3206795 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(115387,1125104,1518037,3175552,1104565,1721918,1115289,1100931,2126886,1363562,1086097,1053162,1066128,2417137,1070672,1083000,1115233,1857841,1045346,1124265,1372281,2141025,2852404,1072138,1409421,1304908,1109416,1127389,1089616,1126456) ORDER BY field (ArticleID,115387,1125104,1518037,3175552,1104565,1721918,1115289,1100931,2126886,1363562,1086097,1053162,1066128,2417137,1070672,1083000,1115233,1857841,1045346,1124265,1372281,2141025,2852404,1072138,1409421,1304908,1109416,1127389,1089616,1126456)