central limit theorem says "the mean of samples from a distribution" is Normal,
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送交者: chouqilozi 于 2008-07-16, 09:47:15:
回答: 个人身高体重是正态分布（有说法是分男女以后），但为什么个人收入不是？ 由 Enlighten 于 2008-07-16, 09:05:53:
not individual measurement. So it doesn't matter what individual height or weight distribution is, the mean height of a fixed size sample follow Normal distribution; same for income, even though personal income shows much larger variations than height, the mean income of a fixed size sample still follows Normal distribution.
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