Below are the final grades for Ms. Romero'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 66.7 and 2 students. Row 2, score of 72.8 and 3 students. Row 3, score of 79.5 and 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 97.4 and 2 students.
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Using the given table, the highest grade is 97.4 and the lowest grade is 66.7. Therefore, the difference between the highest grade and the lowest grade is 97.4 - 66.7 = 30.7.