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avalon9527发表于 2011-2-12 08:11 | 显示全部帖子
average size of an order = total gross sales / 4400 orders
1) the gross sales of amount <100 = the gross sales of amount >=100
2) the gross sales of amount <100 = 134000
so, if both 1) and 2) are true, then the average size should be 134000*2/4400
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avalon9527发表于 2011-2-12 08:17 | 显示全部帖子
it seems i made a mistake.
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