school randomly surveys 20 students and asked them to rate how satisfied they were on a scale of 1-10, where 10 is extremely satisfied and 1 is extremely dissatisfied. Here is the data they collected: 9, 7, 4, 2, 8, 7, 6, 7, 8, 3, 4, 7, 8, 7, 5, 6, 7, 3, 7, 9 Calculate the range.