Question
If $3\left(Q_{3}+Q_{1}\right)=5\left(Q_{3}-Q_{1}\right)=120$, find thequartile deviation and its coefficient.
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| Class | 0-4 | 19-May | 20-29 | 30-54 | 55-70 |
| Frequency | 5 | 10 | 15 | 8 | 2 |