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As median divides an arranged series into two equal parts, in similar way quartile divides an arranged series in 4 equal part. For ungrouped frequency distribution formula of finding ith quartile \( = \) \( Q_{i}=\left\{i .\left(\frac{N+1}{4}\right)\right\}^{\text {th }} \) term, \( i=1,2,3 \).
\( \mathrm{P} \)
Quartile deviation : half of difference between upper quartile \& lower quartile.
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_ \( \Rightarrow \quad \) Quartile deviation (Q.D.) \( =\frac{1}{2}\left(Q_{3}-Q_{1}\right) \Rightarrow \quad \) Coefficient of quartile deviation \( =\frac{Q_{3}-Q_{1}}{Q_{3}+Q_{1}} \).
- If \( 1,2,3,4,5,6,7 \), are numbers then \( Q_{1} \& Q_{3} \) are respectively
(1) 2,4
(2) 2,6
(3) 4,6
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