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Suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 amd a standard deviation

Suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 amd a standard deviation of 0.44. Using the empirical rule, what percentage of the students have grade point averages that are between 1.23 and 3.87

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