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4. (8 marks) The average grade for an exam is 74, and the standard

deviation is 7. Grades are curved to follow a normal distribution and 12% of the class are given A grades. a) What is the lowest possible A and the highest possible B? b) What is the 60th percentile grade?

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4. (8 marks) The average grade for an exam is 74, and the standard deviation is 7. Grades are curved to follow a normal distribution and 12% of the
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