In the set of scores, 17, 15, 26, 21, 12 19, 15, 22, 11, and 20. What is the range? A.4 B. 11 C. 15 D. 26 When the set of data has a range of 72 and 10 as the decided number of class intervals, what is the interval of each class? A. 5 В. 7 C. 9 D. 11 What is the class frequency of 29 - 35? A. 7 B. 6 C. 5 D. 4