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单词 variance
释义 variance
A continuous distribution that has a probability density function f(x) has a variance σ2 defined by
σ2 = ∫-∞(x - µ)2>f(x)dx
,
where µ is defined by
µ = ∫-∞xf(x)dx.

If the distribution is discrete, with a probability function p(x), the variance σ2 is defined by
σ2 = ∫(x - µ)2px
, where µ is defined by
µ = ∫xxpx
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更新时间:2025/6/23 5:45:12