last semester the average overall score in my college algebra class was 72.5, with a standard deviation of 7.5, and the scores were distributed normally. i want to set up a college algebra grade scale such that the top 5% would earn an a, below the top 5% and above the bottom 75% earn a b, the scores below the top 25% and above the bottom 25% earn a c, the scores below the top 75% and above the bottom 5% earn a d and the bottom 5% earn an f. What are the numerical limits for each letter grade?

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