We have expected value, mean or average.

我们可以用期望值，或者是平均值。

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The key thing to remember about random variables is that actual observations are centered around an average, or mean value.

对于随机的变化关键要记住的是，实际的观测资料都在平均数或者中间值周围。

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On average, those with the ‘A’ version, or the ‘mean gene’ gave less than half as much to charity, the University of Bonn study found.

德国波恩大学（University of Bonn）的研究发现，平均而言，那些拥有A版本基因，或称吝啬基因的志愿者愿意捐赠的金钱不到赢得的一半。

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Another important concept in probability theory that we will use a lot is expected value, the mean, or average-- those are all roughly interchangeable concepts.

概率论中另外一个常用的重要的概念是,期望值或者也叫均值,这两个概念可以互换

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I mean, the average, you know, the sort of typical workdays, 8 or 9 hours.

我是说，平均而言，正常的工作日，八九个小时。

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People also call that the mean or the average.

也可以叫做平均值

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The median will consequently always provide a much more accurate reflection of the typical income earner in any top income group than any average or mean.

FORBES: More On The Certain Equality Of Reaganomics

That is because in any lower income group, with both an upper and lower bound to the incomes included, the average or mean income will always be much closer to the median.

FORBES: More On The Certain Equality Of Reaganomics

In that data, the average or mean income of the top 10% of households seems to increase much more from 1989 to 2004 than the average or mean income of the next highest 10%, or of any lower income group.

FORBES: More On The Certain Equality Of Reaganomics