—组样本的变异系数(tO等于10,样本均值为5,则样本方差为（）。[厘门大学 2014研]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30461' and id < 2461175 and id<>'2461175' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30461' and id > 2461175 and id<>'2461175' order by id asc limit 5