The distribution of grades in an introductory finance class is normally distributed, with an expected grade of 77. If the standard deviation of grades is 6, in what range would you expect 68.26 percent of the grades to fall? (Round answers to 2 decimal places, eg. 15.25. Hint Think in terms of what the expected highest and lowest scores would be for 68.26% of the students taking the exam.)

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68.26 percent of the grades should fall beween the ranges (lower end) _____ and upper end _____?