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Bellevue College

Pre-Algebra: Lesson 160

Central Tendency
Range, Median, and Mode

Lesson Description

Students learn that the range of a given data set is the difference between the largest number and the smallest number in the data set. For example, in the data set {6, 6, 7, 8, 11, 13, 15}, the range is 15 - 6, which equals 9. The median is the middle number in the data set when the numbers are written from least to greatest. So in the data set above, the median is 8. If there is no middle number in the data set, the median is the average of the two middle numbers. The mode is the number in a data set that appears most often. So in the data set above, the mode is 6.

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