A group of students from an American school are selected for a study. The color of the eyes of the students are noted as below:
| Color of Eyes | Number of Students |
|---|
| brown | 9 |
| grey | 8 |
| green | 11 |
| black | 8 |
| blue | 4 |
What is the probability that the color of a student's eyes, chosen randomly, is green?