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Suppose that grade point average of undergraduate students at one university have a bell shaped distribution with a mean if 2.54 and a standard deviation

Suppose that grade point average of undergraduate students at one university have a bell shaped distribution with a mean if 2.54 and a standard deviation of 0.42. Using the empirical rule, what percentage of the students have grade point averages that are between 1.28 and 3.8

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