The mode is a measure of central tendency of a set of data represented by numbers.

The mode is the most frequently occurring number.

There is no standard symbol associated with the mode.

DATA: { 1, 2, 3, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }

Since the number three occurs more frequently than any other number, the mode of this set of data is three.

DATA: { 1, 2, 3, 3, 3, 4, 5, 5, 6, 6, 6, 7, 8, 9 }

Since the numbers three and six occur more frequently than any other number (and the number of threes and sixes are equal), the modes of this set of data are three and six.

DATA: { 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7 }

Since no number occurs more frequently than any other number, this set of data has no mode.