The table shows the number of students who attended a school's drama club meetings over four weeks.
| Week | Number of Students |
|---|---|
| Week 1 | 28 |
| Week 2 | 32 |
| Week 3 | 25 |
| Week 4 | 35 |
What was the average number of students who attended the drama club meetings per week?
29
30
30.5
31
