Age in years 10 - 14 15 - 19 20 - 24 25 - 29
FURTHER MATHEMATICS
WAEC 2014
| Age in years | 10 - 14 | 15 - 19 | 20 - 24 | 25 - 29 | 30 - 34 |
| Frequency | 6 | 8 | 14 | 10 | 12 |
Find the mean of the distribution.
- A. 23.4
- B. 23.6
- C. 24.3
- D. 24.6
Correct Answer: A. 23.4
Explanation
| Age in years | Classmark (x) | Frequency (f) | fx |
| 10 - 14 | 12 | 6 | 72 |
| 15 - 19 | 17 | 8 | 136 |
| 20 - 24 | 22 | 14 | 308 |
| 25 - 29 | 27 | 10 | 270 |
| 30 - 34 | 32 | 12 | 384 |
| Total | 50 | 1170 |
\(Mean = \frac{\sum fx}{\sum f}\)
= \(\frac{1170}{50} = 23.4\)
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