6) (4 pts) Final averages are typically normally distributed with a mean of 72 and a standard deviation of 12.5. Your professor states that the top 10% of the class will receive an A; the next 15% will receive a B; the next 48% will receive a C; the next 15% will receive a D; and the bottom 12% will receive an F. What grade must you exceed in order to receive a grade of C or better