Marks obtained by 90 students of Class IX in a test are given below:
Marks |
0−20 |
20−40 |
40−60 |
60−80 |
80−100 |
No. of students |
8 |
15 |
32 |
26 |
9 |
Out of these students one is chosen at random. Find the probability that the chosen student obtains
(i) less than 20% marks
(ii) 80% or more marks
(iii) 60% or more marks