Median is a mathematical statistical term, which refers to the arithmetic average of the upper and lower limits of group spacing. When the number of terms n of the variable value is odd, the variable value in the middle position is median; When n is an even number, the median is the average value of the two variables in the middle.

Median is also called median, that is, data are arranged in ascending or descending order. If there are n data, when n is an even number, the median is the average of the n/2nd bit and the (n+2)/2nd bit. If n is odd, then the median value is (n+ 1)/2 digits.