For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class.

Question

For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 20 students, and the distribution of total study hours per week is bell-shaped with a mean of 13 hours and a standard deviation of 3.3 hours

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.

Answer 1

68% percent of the students hours will be between mean +/- 1 standard deviation

95% percent of the students hours will be between mean +/- 2 standard deviations

99.7% percent of the students hours will be between mean +/- 3 standard deviations