Question
For a group, if quartile deviation is $4.2$ and first quartile is $21$ then find the third quartile.
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| Class | 1 – 1.475 | 1.5 – 1.975 | 2 – 2.475 | 2.5 – 2.975 | 3 – 3.475 | 3.5 – 3.975 | Total |
| Frequency | 5 | 10 | 20 | 20 | 10 | 5 | 70 |