You are studying for your final exam of the semester. up to this point, you received 3 exam scores of 84%, 65%, and 90%. to receive a grade b in the class, you must have an average exam score between 80% and 89% for all 4 exams including the final. find the widest range of scores that you can get on the final exam in order to receive a grade of b for the class. use interval notation. a- (75,100) b-(81,100) c-(84,97)