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...

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 2.5 hours.


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 the students spend between hours and hours on Statistics each week.