The ages of students in a small primary school were recor...
The ages of students in a small primary school were recorded in the table below.
| Age | 5 - 6 | 7 - 8 | 9 -10 |
| Frequency | 29 | 40 | 38 |
Estimate the mean
7.7
7.5
7.8
7.6
Correct answer is A
| Class Interval | Class Mark | Frequency (f) | fx |
| 5 - 6 | 5.5 | 29 | 5.5 x 29 = 159.5 |
| 7 - 8 | 7.5 | 40 | 7.5 x 40 = 300 |
| 9 - 10 | 9.5 | 38 | 9.5 x 38 = 361 |
| ∑f=107 | ∑fx=820.5 |
Mean = ∑fx∑f=820.5107 = 7.7 (1 d.p)
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