Mathematical model, if you need to get a loan from a bank, it is calculated according to the loan amount, and there are factors such as age, salary, assets, etc., which are converted into mathematics here:
Now we are trying to fit a graph made by a plane, but the theoretical value of this fitting is different from the actual result. Now we use the method of error calculation in statistics, we think that each error is independent and identically distributed , and obey a Gaussian distribution with zero mean and zero variance. Independence is: Zhang San and Li Si take a loan together, and the two do not affect each other and have nothing to do with each other. Identical distribution is: the same distribution under the same model. Gaussian distribution: Banks may give more or less, but in most cases, the fluctuation will not be too large, and in extremely small cases, the fluctuation will be relatively large, which is in line with normal conditions.
