Ahumanities professor assigns letter grades on a test according to the following scheme. a: top 12% of scores b: scores below the top 12% and above the bottom 63% c: scores below the top 37% and above the bottom 16% d: scores below the top 84% and above the bottom 8% f: bottom 8% of scores scores on the test are normally distributed with a mean of 80.1 and a standard deviation of 7.2. find the minimum score required for an a grade. round your answer to the nearest whole number, if necessary.