Quartile deviation for a frequency distribution is
- A$Q = Q_3 - Q_1$
- B$Q = \frac{1}{2}(Q_3 - Q_1)$
- C$Q = \frac{1}{3}(Q_3 - Q_1)$
- D$Q = \frac{1}{4}(Q_2 - Q_1)$
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