For a moderately skewed distribution,quartile deviation and the standard deviation are related by
- A$S.D. = \frac{2}{3} Q.D.$
- B$S.D. = \frac{3}{2} Q.D.$
- C$S.D. = \frac{3}{4} Q.D.$
- D$S.D. = \frac{4}{3} Q.D.$
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