Mode

The mode is the number that occurs most often in a set of numbers. Some sets of numbers have more than one mode, and some sets have no mode.
 
Example: one mode for a set of numbers
Given this set of numbers: 1, 3, 3, 4, 7, 8
Mode: 3
 
Example: more than one mode for a set of numbers
Given this set of numbers: 1, 3, 3, 4, 7, 7, 8
Modes: 3, 7
 
Example: no mode for a set of numbers
Given this set of numbers: 1, 3, 4, 7, 8
Mode: none

See also average.