Izzy had an 82 and an 88 on his first two tests and believed that he did well enough on his final exam to keep his b average. however, when he got his grade he received a d. he checked with his instructor and learned that the instructor had made a mistake by transposing the digits when he recorded the final exam grade. if izzy's incorrect average (mean) for the class was 69, what was his correct final exam score?