The following histogram represents quiz scores and uses the interval bins: 1-5, 6-10, 11-15, 16-20, 21-25, 26-30, 31-35, and 36-40 Grades on 40-Question Quiz Frequency 0 15 10 10 5 6 1-5 6-10 7 11 9 7 11-15 16-20 Grade on Quiz 21-25 5 4 26-30 31-35 36-40 For students who earned a score of 21 or higher on the quiz, the cumulative frequency is and the relative cumulative For students who earned a score of 21 or higher on the quiz, the cumulative frequency is and the relative cumulative frequency is a.) 7; 14% b.) 10; 20% Oc.) 21; 42% O d.) 17; 34%