来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  I've got that Ale is the tallest
  艾尔是最高的
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  and Myrto is the smallest, is that right?
  米尔托是最矮的 没错吧
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  So I don't know instantaneously what this average would be,
  我不能马上说出平均身高是多少
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  but I claim that any weighted average of their three heights,
  但我知道平均身高是一个加权平均数
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  is going to give me a number that's somewhere
  它一定介于
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  between the smallest height of the three, which is Myrto's height,
  三人中最矮的米尔托
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  and the tallest height of the three, which is Ale's height.
  和最高的艾尔的身高之间
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  Is that right? Is that correct?
  是这样吧
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  So that's a pretty general idea.
  这是个世人皆知的道理
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  Thanks guys I'll come back to you in a second.
  有劳三位了 待会还要麻烦你们一下
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  Let's think about this somewhere else,
  我们再来举个例子
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  let's think about the batting average of a team.
  比如说一个球队的平均击球率