| 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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