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Question
The following frequency distribution table shows marks obtained by 180 students in Mathematics examination.
| Marks | No. 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.
Solution
25 + x + 30 + 2x + 65 = 180
3x + 120 = 180
3x = 180 − 120
3x = 60
x = `60/3`
x = 20
| Marks | No. of students |
| 0 – 10 | 25 |
| 10 – 20 | 20 |
| 20 – 30 | 30 |
| 30 – 40 | 40 |
| 40 – 50 | 65 |
| Total | 180 |
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