Calculating the Range of Exam Scores

In statistics, measures of dispersion are used to describe the spread or variability of a set of data points. The range is one of the simplest measures of dispersion, defined as the difference between the largest and smallest value in a data set.

Consider the following data set containing the final exam scores of 5 students: 78, 85, 91, 67, and 88. What is the range of this data set?