Below are the final grades for Mr. Campbell's class. What is the difference between the highest grade and the lowest grade?
A table with 2 columns, score and students. Row 1, score of 65.5 and 2 students. Row 2, score of 71.8 and 3 students. Row 3, score of 77.7 and 5 students. Row 4, score of 85.0 and 8 students. Row 5, score of 89.9 and 5 students. Row 6, score of 91.3 and 3 students. Row 7, score of 97.6 and 2 students.