来自《耶鲁大学开放课程：博弈论 第9集 第9集》

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  In particular, what we're going to worry about are expected payoffs.
  其实我们要研究的是预期收益
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  So the expected payoff of the mixed strategy P,
  混合策略P的预期收益是
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  let's be consistent and call it Pi,
  我们保持一致 还是称之为Pi吧
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  the mixed strategy Pi is what?
  混合策略Pi的预期收益是什么呢
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  It's the weighted average.
  其实是个加权平均数
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  it's a weighted average or a weighted mixture if you like,
  是该混合策略中
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  of the expected payoffs of each of the pure strategies in the mix.
  每个纯策略预期收益的加权平均数
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  So this is a long way of saying something again
  我们费了很多工夫来解释混合策略
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  which I think is a little bit obvious,
  我觉得它其实很容易理解
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  but let me just say it again.
  但我还是再说一遍吧
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  The way in which we figure out the expected payoff of a mixed strategy is,
  计算混的策略预期收益的方法是
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  we take the appropriately weighted average of the expected payoffs
  实际上就是求出该混合策略中