In statistics, the range of a data set is the difference between the highest value and the lowest value in the data set.
Example #1
Albert earned the following scores in his math tests:
Chapter 1 test: 90
Chapter 2 test: 85
Chapter 3 test: 70
Chapter 4 test: 98
Chapter 5 test: 81
The highest score is 98 and the lowest score is 81.
To find the range, subtract the lowest value from the highest value.
Range = 98 - 81 = 17
The range in Albert's score is 17
Example #2
Sarah earned the following scores in her math tests:
Chapter 1 test: 90
Chapter 2 test: 91
Chapter 3 test: 89
Chapter 4 test: 90.5
Chapter 5 test: 89.5
The highest score is 91 and the lowest score is 89.
To find the range, subtract the lowest value from the highest value.
Range = 91 - 89 = 2
The range in Sarah's score is 2
The range of a set of data is a measure of variation. The range in the example #2 is much smaller than the range in example #1. This means that the scores do not vary a lot or are more consistent. This could mean that Sarah has a tendency to be always prepared to take a test.
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