怎么算平均数

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select * from tbl_Articles WHERE ArticleID=739791 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=739791 LIMIT 0,1
select * from tbl_Articles_sphinx where id=739791 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(372528,475194,428699,509355,3220846,1094098,410142,474070,405062,424214,394878,431377,413542,1106829,420386,410660,100482,543722,476389,443301,477821,1522428,374657,486283,485349,404019,790974,1106950,2807144,451322) ORDER BY field (ArticleID,372528,475194,428699,509355,3220846,1094098,410142,474070,405062,424214,394878,431377,413542,1106829,420386,410660,100482,543722,476389,443301,477821,1522428,374657,486283,485349,404019,790974,1106950,2807144,451322)