JAMB - Mathematics (2010 - No. 20)
| Marks | 1 | 2 | 3 | 4 | 5 |
| Frequency | 2 | 2 | 8 | 4 | 4 |
The table above show the marks obtained in a given test.
Find the mean mark
3.1
3.0
3.2
3.3
Explanation
| Mark(χ) | f | fχ |
| 1 | 2 | 2 |
| 2 | 2 | 4 |
| 3 | 8 | 24 |
| 4 | 4 | 16 |
| 5 | 4 | 20 |
| ∑f = 20 | ∑fχ = 66 |
\(Mean = \frac{\sum fx}{\sum f}\)
= \(\frac{66}{20}\)
= 3.3
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