Comparing measures of center and variation The test scores of the students in four classes are summarized below. Answer the questions about them. Class A: The range of scores is 23 and the mean score is 123, Class B: The range of scores is 31 and the mean score is 120. Class C: The range of scores is 28 and the mean score is 122. Class D: The range of scores is 30 and the mean score is 116. (a) Based on the information above, which class's scores have the most variability? Class A Class B Class C O Class D (b) Based on the information above, which class has the lowest scores on average? Class A O Class B Class C Class D