Help please?

8. An instructor is interested in comparing exam scores for fraternity and non-fraternity males in her class. Meaningful comparisons between two sets of data can be made using a side-by-side stem-and-leaf display. To illustrate this, note the following display summarizing the scores. Leaf (Non-Fraternity) Stem Leaf (Fraternity) 0 9 2 408 2 5794551 39 Co 26697732160 275 56489902 4767 447810322689 68995 5478438891 J 342786743 SS 2974 4538996421145 42 9 435167703 a. What level of measurement does the data possess? b. Based upon the stem-and-leaf display, compare the two groups. Think of the several ways in which this can be done. c. Suppose that 60% is considered a passing score on the exam. What percent of the fraternity students passed the exam? Non-fraternity students? d. If someone scores 90 or higher on the exam, they will be exempt from taking the next exam. What percent of the fraternity students will be exempt from taking the next exam? Non-fraternity students