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Re:第一个sample为什么是3.0呢？In Reply To:第一个sample为什么是3.0呢？ Posted by:wpt at 2007-03-24 14:48:00 > mean=60.0 sd=32.7 > 平均分是103.0 84.0 20.0 > 得分不是 3 3 2 吗？ 同问,求解答 Followed by:
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