The following table summarizes the number of hours per week two study groups, Group M and Group N, spend practicing math.
| Hours per Week | Group M | Group N |
|---|---|---|
| 4 | 1 | 0 |
| 5 | 2 | 1 |
| 6 | 1 | 2 |
| 7 | 3 | 3 |
| 8 | 0 | 1 |
| 9 | 1 | 3 |
| Total | 8 | 10 |
By how much does the median for Group N exceed the median for Group M?
