The mean score for a math test taken by class a is 84, with the scores ranging from 78 to 94. the mean score for the same math test taken by class b is 76, with the scores ranging from 68 to 88. which best compares the scores of the two classes? a) the highest score for the test was in class b. b) on average, the scores of class a are lower than class b. c) the scores of class b vary less than the scores of class a. d) the scores of class a vary less than the scores of class b.