Our student course evaluation forms ask students to report the average number of hours per week spent preparing. In Spring 2005, we got the following distribution (N = 30):
| 8-9 hrs | 5 |
| 10-11 hrs | 5 |
| 12-13 hrs | 5 |
| 14-15 hrs | 3 |
| 16-17 hrs | 5 |
| 18-19 hrs | 2 |
| 20-21 hrs | 3 |
| 22 or more hrs | 2 |
To save you the effort: this says that the median (and mean) was 13-14 hours per week. So be warned!