The table above shows the favorite subjects of a group of students by their grade level. If one student is selected at random from this group, what is the probability that the student is a Grade 9 student whose favorite subject is Math?
| Subject | Grade 9 | Grade 10 | Total |
|---|---|---|---|
| Math | 4 | 3 | 7 |
| Science | 2 | 1 | 3 |
| Total | 6 | 4 | 10 |
