We have the following:
The mean of a data set
The mean of a set of numbers, sometimes simply called the average, is the sum of the data divided by the total number of data.
The median of a data set
The median of a set of numbers is the middle number in the set (after the numbers have been arranged from least to greatest) - or, if there is an even number of data, the median is the average of the two middle numbers.
The mode of a data set
The mode of a set of numbers is the number that occurs most often.