A choir rehearsal has 30 singers of different voice parts, summarized in the table below:
| Voice Part | Number of Singers |
|---|---|
| Soprano | 5 |
| Alto | 8 |
| Tenor | 7 |
| Bass | 10 |
If a singer is chosen at random, what is the probability that the singer is an alto?
0.20
0.27
0.30
0.33
