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Random variable is the mathematical expectation value for the characterization of the average location or centralized location, random variable mathematical expectation, also known as X probability P to the right of the weighted average. So mathematical expectation of economic decision-making is an important basis for decision-making. By calculating all decision-making programs mathematical expectation value of the gains or losses can quickly make a decision. Decision program is the largest of mathematical expectation of the program as the best option to decision-making. Know if any one program in each Bi natural conditions (factors) of the Qi, Bi implementation plan arising from the profit value ai, and the natural conditions of the probability Pi, The program is all profit expectations : ai*Pi more options in the expected profit Select the largest profit expectations for the best option. Through the introduction of Matrix operations described in mathematical expectation greatest expectations, Decision tree and the largest expected utility criteria for the application of mathematics in economic decision-making expectations of the important role.

Mathematics of the random variable expects to be used for delineating the average positions or centralized positions of the fetching value, mathematics of random variable ζ expects to call X weighted average taking probability P as right too. So mathematics expects it is an important decision basis in the economy make policy. Through calculate each decision mathematics benefit decreasing value that expect of scheme can make decision quickly. Decision scheme to expect mathematics heavy scheme make policy as best scheme most. If know any scheme Bi in a situation that each natural state (influence factor) Qi takes place, the profit value ai that the implementing scheme Bi produced, and the probability Pi that each right state take place, the expectation of each scheme makes profits: Ai *Pi, compare each scheme of expectations make profits, choose, expect profit a loud one the best scheme most it. Through introducing the operation of matrix, explain the application that mathematics expected in biggest expected value law, tree type decision law and greatest expected utility criterion, explain mathematics and expect the important function in economy make policy.

The mathematics expectation which random changes to measure is randomaverage position or concentration position which used for depicting to take a value and random change mathematics of measure the ζ expect to also be called few Xs with all rate P for add of power the power be average.So mathematics expectation be in the economic decision of an important decision basis.Pass to compute mathematics that each one makes policy a project expect of the benefit Sun value can do a decision very quickly.Make policy the project is to expect mathematics that the best project of the biggest project conduct and actions takes in to make policy.If know any project Bi under the circumstance that each one natural condition(impact factor) Qi occurrence, the earnings produce by implement project Bi value ai, and respectively however condition occurrence of all rate Pi, then the expectation earnings of each project:ai*Pi, more the expectation earnings of each project, the choice expects that the profits is the biggest among them of is the best project.Pass to usher in a matrix operation, elaborate that mathematics expects in the biggest expectation value method, tree type decision method and biggest expectation application within effect standard, elucidation mathematics expects in the economy the decision of important function.