Last semester the overall score of College Algebra classes was 72.5 with a standard deviation of 7.5 and the scores were distribuited normally. I want to set up a College algebra grade scale such that the top 5% of scores would earn A, scores below top 5% and above the bottom 75% earn a B, scores top 25% and above the bottom 25% earn a C, scores below top 75% and above the bottom 5% earn a D, and bottom 5% earn an F. Wwhat are the numerical limits for each letter grade?

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