The following table shows marks obtained by 40 students in a Mathematics quiz competition
| Monthly Income | Number of Workers |
| 0 - 20 | 3 |
| 20 - 40 | 6 |
| 40 - 60 | 12 |
| 60 - 80 | 14 |
| 80 - 100 | 5 |
Answer the following questions :
(i) Number of students who obtained marks in the groups 40 – 60.
(ii) This marks group having maximum number of students ?
(iii) Number of students who obtained more than 60 marks.
