The average of primary schools refers to the arithmetic average, which refers to the sum of all the data in a set of data divided by the number of data. It is an indicator reflecting the trend of data concentration.

When the sum of n numbers is divided by n, the quotient is called the arithmetic average of these n numbers. ?

Formula:

The average value is a quantity representing the trend in a set of data, which refers to the sum of all data in a set of data divided by the number of data in the set. It is an indicator reflecting the trend of data concentration. The key to solve the problem of average application is to determine the "total amount" and the total number of copies corresponding to the total amount.

Harmonic average

Harmonic average is a kind of average. But statistical harmonic mean is different from mathematical harmonic mean. In mathematics, harmonic average and arithmetic average are independent and self-sufficient. The calculation results are different, and the former is always smaller than the latter.

Therefore, the mathematical harmonic average is defined as the reciprocal of the average of reciprocal values. But the statistical weighted harmonic average is different. It is a deformation of the weighted arithmetic mean, which is attached to the arithmetic mean and cannot be established independently.

And the calculation result is completely equal to the weighted arithmetic average. It is mainly used to solve the problem that only the variable value of each group and the corresponding total number of symbols are needed and the average value is required when the overall unit number (frequency) cannot be mastered.