For a 4unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 22 students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 2.6 hours. Use the Empirical Rule to answer the following questions. a) 68% of the students spend between I:] hours and [3 hours on Statistics each week. b) 95% of the students spend between C] hours and C] hours on Statistics each week. c) 99.7% of the students spend between C] hours and C] hours on Statistics each week