Mode is the number in a number list that occurs most often. However, if no number in a number list is repeated, then there is no mode for the list.

Range is just the difference between the largest and smallest numbers in a number list.

For example, in the number list 13, 18, 13, 14, 13, 16, 14, 21, 13, 13 is the mode as this number occurs the most often; And the range, between the largest number 21 and the smallest number 13, is 8.