A person's grade in school is generally identified by a number. a) Give an example of a why in which grade level is treated as categorical. b) Give an example of a why in which grade level is treated as quantitative. OA. A principal wants to know how the average grade of a statistics student in their school compares to the average grade of statistics students across the country. OB. A principal is assigning each student a time for recess. She wants to have students of the same age on the playground at the same time, so she schedules all the students in a given grade at the same time. OC. A principal is concerned that a disease may be more likely to infect younger students. She finds the average grade level of students who are absent on several days. OD. A football coach wants to know the mean grades of several teams to ensure game matchups are as fair as possible.