going into the final exam, which will count as ¼ of the final grade, haley has test scores of 85, 92, 93, 86, 88, and 90. what score does haley need on the final exam in order to have an average of 90?

When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?