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Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.6 2.6 and a standard deviation

Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.6

2.6 and a standard deviation of 0.44

0.44. Using the empirical rule, what percentage of the students have grade point averages that are between 1.28

1.28 and 3.92

3.92?

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