At a community center, 50 students were asked whether they brought lunch from home and whether they participate in the chess club. The results are shown in the table.
| Participates in chess club | Does not participate in chess club | Total | |
|---|---|---|---|
| Brought lunch from home | 9 | 21 | 30 |
| Did not bring lunch from home | 6 | 14 | 20 |
| Total | 15 | 35 | 50 |
If a student who brought lunch from home is selected at random, what is the probability that the student participates in the chess club?