Ptt 大爆卦 | variance中文 - 前往 https://www.khanacademy.org/math/ap-statistics/random-variables-ap/combining-random-variables/v/variance-of-differences-of-random-variables

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Deriving the variance of the difference of random variables

what I want to do in this video is build up some tools in our toolkit for dealing with sums and differences of ...

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