Question
For a data quartile deviation is $10$ and coefficient of quartile deviation is $0.8$. Find the values of $Q_{1}$ and $Q_{3}$
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| Particulars | Series A | Series B |
| No. of observations | $40$ | $50$ |
| Average | $25$ | $30$ |
| The sum of squares of deviations taken from mean | $640$ | $1800$ |