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The table given below shows the marks obtained by 30 students in a test.
| Marks (Class interval) | 1-10 | 11-20 | 21-30 | 31-40 | 41-50 |
| Number of students (Frequency) | 7 | 10 | 6 | 4 | 3 |
Out of these students, one is chosen at random. What is the probability that the marks of the chosen student
(i) are 30 or less?
(ii) are 31 or more?
(iii) lie in the interval 21 – 30?