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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 \( = \) \( Q_{i}=\left\{i \cdot\left(\frac{N+1}{4}\right)\right\}^{\text {th }} \) term, \( i=1,2,3 \).
\( \mathrm{P} \)
Quartile deviation : half of difference between upper quartile \& lower quartile.
W
_ \( \Rightarrow \quad \) Quartile deviation (Q.D.) \( =\frac{1}{2}\left(Q_{3}-Q_{1}\right) \Rightarrow \quad \) Coefficient of quartile deviation \( =\frac{Q_{3}-Q_{1}}{Q_{3}+Q_{1}} \).
- Quartile deviation of the following numbers \( 10,8,12,11,14,9,6 \) is
(1) 2
(2) 10
(3) \( 1 / 2 \)
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