There are two common methods to calculate the average: one is the simple average method, and the other is the weighted average method. There are geometric average, square average (root mean square, rms), harmonic average and other methods.

The average method is:

1, direct solution. Calculating the average value by formula is a method that the idea of "equal division" comes into being.

2. Cardinality method. Find the average value by formula. Here is the method of choosing the smallest number as the cardinal number, which is produced by the idea of "making up the difference"

The average value is the most commonly used statistic in statistics, and it is the quantity that represents the trend in a group of data. Refers to the sum of all the data in a set of data divided by the number of this set of data. It is an indicator reflecting the trend of data concentration. There are three methods to find the average: direct method and radix method. The key to solving the problem is to find the "total score" corresponding to the "total amount"