JAMB 2000 · UME · Q50
The table shows the frequency distribution of the ages (in years) of pupils in a secondary school. What percentage of the pupils are over 15 years but less than 21 years?
| Interval (years) | 10–12 | 13–15 | 16–18 | 19–20 | 21–23 |
|---|---|---|---|---|---|
| No. of pupils | 6 | 14 | 15 | 10 | 5 |
Worked solution (try it first)
- Over 15 but under 21 means the classes 16–18 and 19–20: pupils.
- Total pupils: .
- As a percentage: , option C.