For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 26 students, and the distribution of total study hours per week is bell-shaped with a mean of 12 hours and a standard deviation of 3.5 hours. I Use the Empirical Rule to answer the following questions. a) 68% of the students spend between____ hours and____ hours on Statistics each week. b) 95% of the students spend between___ hours and hours on Statistics each week._____ C)99.7% of Students spend between____hours and____ Hours on statistics each week