Abstract
Mathematical expectation is a reflection of the overall value of random variables, the average level of an important figure.In the economy life, there are many problems can be directly or indirectly using mathematical expectation to solve..From the content of mathematical expectation, it analysises the mathematical expectation in economic decision-making.Through some examples to explain the solving ways and steps about mathematical expectation from this article. In the second part, it describes economy decisions’ fundamental and solving steps, it also combines mathematical expectation and economy problems, uses some examples to show the feasibility of using mathematical expectation method to answer economy decisions. Finally, depending on mathematical expectation to the establish the merchant supplies the best model, investors, civil litigation preferences factors and various decision-making problem in mathematics as a profitable expectations, the problem in mathematics to the application of economic decision-making.
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Keywords: Mathematical expectation; Economic decision-making ;Profit value
