For a 4-units class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 3 hours. Use the Empirical Rule to answer the following questions. a) 95% of the students have study hours that are between ___ and ___. c) What percentage of the students have study hours that are below 16

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