For example: We are given the following class scores on a mathematics test, arranged in order from lowest to highest scores: 48, 49, 54, 55, 65, 76, 77, 78, 78, 81, 83, 85, 88,
89, 89, 89, 90, 91, 93, 96, 99 The lowest score is 48 and the highest score is 99. Therefore, the range of the test scores = 99  48 = 51 points.
