The distribution of grades in an introductory finance class is normally distributed, with an expected grade of 66. If the standard deviation of grades is 8, in what range would you expect 90.00 percent of the grades to fall? (Round answer to 2 decimal places, e.g. 15.25. Hint: Think in terms of what the expected highest and lowest scores would be for 90.00% of the students taking the exam.)