|Problem:||Cheryl took 7 math tests in one marking period. What is the range of her test scores?|
|89, 73, 84, 91, 87, 77, 94|
|Solution:||Ordering the test scores from least to greatest, we get:|
|73, 77, 84, 87, 89, 91, 94|
|highest - lowest = 94 - 73 = 21|
|Answer:||The range of these test scores is 21 points.|
|Definition:||The range of a set of data is the difference between the highest and lowest values in the set.|
In the problem above, the set of data consists of 7 test scores. We ordered the data from least to greatest before finding the range. We recommend that you do this, too. This is especially important with large sets of data.