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Question 11 3 pts Details For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 24 students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 2.7 hours. Use the Empirical Rule to answer the following questions. a) 68 % of the students spend between 9.7 x hours and 16.3 Xhours on Statistics each week. b) 95% of the students spend between 6.4 hours and 19.6 x hours on Statistics each week. c) 99.7% of the students spend between 3.1 x hours and 22.9 x hours on Statistics each week.