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One Punch Chen2019-06-21 09:34:10
The variance is the sum of the squared deviations from the expected value weighted by the probability of each outcome.
The expected value is Probability * outcomes 求期望就是求平均
The variance is Sum【Pi(Xi-Xaverage)^2】就是每个outcome与expected value的差的平方 再乘以其权重 再加总。
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