You are studying for your final exam of the semester. up to this point, you received 3 exam scores of 67%, 68%, and 78℅. to receive a grade of c in the class, you must have an average exam score between 70% and 79% 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 c for the class. use interval notation.

a) [70,71]
b) [62,100]
c) [67,100]