| Marks | 5 - 7 | 8 - 10 | 11 - 13 | 14 - 16 | 17 - 19 | 20 - 22 |
| Frequency | 4 | 7 | 26 | 41 | 14 | 8 |
The table above shows the marks obtained by 100 pupils in a test. Find the upper class boundary of the class containing the third quartile.
The third quartile can be found in the \((\frac{3N}{4})^{th}\) position
= \((\frac{3 \times 100}{4})^{th}\) position
This is found in the class 14 - 16.
The upper class boundary = 16.5
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