Mathematical expectation is important concept of probability theory, to apply mathematic expectation discuss economic problems, and obtain useful conclusions.
数学期望是概率论的一个重要概念，应用数学期望讨论某些经济问题，从而得到一些有意义的结论。
Mathematical expectation is important concept of probability theory, to apply mathematic expectation discuss economic problems, and obtain useful conclusions.
数学期望是概率论的一个重要概念，应用数学期望讨论某些经济问题，从而得到一些有意义的结论。
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