Below are the final grades for Mrs. Riley'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 64.3 and 2 students. Row 2, score of 72.8 and 3 students. Row 3, score of 79.5and 5 students. Row 4, score of 84.0 and 8 students. Row 5, score of 88.5 and 5 students. Row 6, score of 92.4 and 3 students. Row 7, score of 99.5 and 2 students.
The highest grade is 99.5 and the lowest grade is 64.3.
The difference between the highest grade and the lowest grade is 99.5 - 64.3 = 35.2.