Question

The following frequency distribution table shows marks obtained by 180 students in Mathematics examination.

| Marks | Number of Students |
| 0 -10 | 25 |
| 10 -20 | x |
| 20 -30 | 30 |
| 30- 40 | 2x |
| 40- 50 | 65 |

Find the value of x.

Also draw a histogram representing the above information.

Answer 1

25 + x + 30 + 2x + 65 = 180 (given)

3x = 60

x = 20