A statistics professor gives a survey to each of the 20 students in an introductory statistics course. The survey asks the students to estimate when they typically wake up on weekdays. The data are recorded in terms of the number of hours after midnight the students wake up. The data are included below. Use Excel to calculate the population standard deviation and the population variance. Round your answers to three decimal places.

Wake up time
7.5
7.5
7.5
7.5
7.5
7
7
7
7
7
7
7
6.5
6.5
6.5
6
6
6.7
6.5
6.5