A survey asked 50 students about their favorite school subject. The results are shown in the frequency table below:
| Subject | Number of Students |
|---|---|
| Math | 15 |
| Science | 10 |
| English | 12 |
| History | 8 |
| Art | 5 |
If one student is chosen at random from the surveyed group, what is the probability that their favorite subject is Math or Science?
0.20
0.25
0.30
0.50
