Expected value = highest estimated value × probability+most likely estimated value × probability+lowest estimated value × probability

Expected sales value = σ (sales in each case × occurrence probability in each case). Under the condition that the expected value method can be used to judge the future market, the average value of the sales forecast and the expected sales value that may be obtained by the probability of the occurrence of the forecast value in each case.

In probability theory and statistics, expected value (or mathematical expectation, or mean value, called expectation for short, in physics) refers to the sum of the possible results multiplied by the results in a discrete random variable experiment.

In other words, the expected value is the average of the equivalent "expectations" calculated by repeating the results of random experiments under the same opportunity. It should be noted that the expected value is not necessarily equal to the common sense "expectation"-"expected value" is not necessarily equal to every result. (In other words, the expected value is the average of the output values of variables. The expected value is not necessarily contained in the output value set of the variable).

Academic interpretation

1. Expectation refers to people's subjective estimation of achieved goals;

2. Expectation refers to people's subjective estimation of whether their actions and efforts can lead to expected results, that is, judging the possibility of achieving goals according to individual experience;

3. Expectation refers to the prediction of some incentive efficiency;

4. Expectation refers to the subjective desire of the public for all the connotations such as moral standards, outlook on life and values that individuals or classes in a certain social position and role should have.