The expected overall value of the estimate (E) is the weighted average

期望的整体估计（E）值是加权平均值

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According to Bloomberg, the weighted average maturity of all American public debt is now around five years.

根据Bloomberg的说法，现在美国公债的加权平均到期期限是5年左右。

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But if the region has a strange shape or if a density is not homogeneous, if parts of it are heavier then you will get whatever the weighted average will be.

但如果这区域的形状很特殊，或者密度不均匀，也就是某些部分比较重，那就需要求加权平均值。

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That'll be the weighted average.

这就是成绩的加权比例

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But they're accountable and we can list all possible values when they're discrete and form a probability weighted average of the outcomes.

但随机变量是离散的话,我们可以把所有的可能值列出来,然后算出加权平均值

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According to Bloomberg, the weighted average maturity of all American public debt is now around five years.

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