来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  I would have got from the pure strategies.
  纯策略的预期收益之间
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  Let me say it again.
  我再来重复一遍
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  In general, when I play a mixed strategy the expected payoff I get,
  一般我选择混合策略获得的预期收益
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  is a weighted average of the expected payoffs of
  是该混合策略所包含纯策略
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  each of the pure strategies in the mix,
  预期收益的加权平均数
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  and weighted averages always lie inside the payoffs
  此加权平均数一定介于混合策略所含
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  that are involved in the mix.
  纯策略的预期收益之间
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  So let me try and push that simple idea a little harder.
  接下来我们继续深入学习
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  Suppose I was going to take the average height in this class.
  假设我想计算教室里同学的平均身高
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  So let me just, rather than use the class,
  与其说计算同学的身高
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  let me just use some T.A.'s here.
  不如就计算助教的平均身高吧
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  So let me get these three T.A.'s to stand up a second.
  请这三位助教站起来一下