The commonly used "average" and "average" basically mean the same thing. But in the field of statistics, the concept of "average" can be expressed in three ways. It is the "mean", "mode" and "median", and "mean" is the "arithmetic average" and "mathematical average", which is what most people understand in our daily non-academic time. The other two "modes" and "average" are both methods that can be used to express "approximate average", that is, position average. Therefore, in the field of statistics, "average" only refers to the arithmetic average, and "average" also includes median and mode.