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For a 4-unit class like statistics, studensts should spend an aberage of 12 hours studying for...

For a 4-unit class like statistics, studensts should spend an aberage of 12 hours studying for the class. A survey was done on 25 students , and the distribution of total study hours per week is a bell shape with a mean of 14 hours and a standard deviation of of 2.6 hours.

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