If \( 25 \% \) of the observations in a frequency distribution are less than 20 and \( 25 \% \) ...

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If \( 25 \% \) of the observations in a frequency distribution are less than 20 and \( 25 \% \) are more than 40 , then the quartile deviation is
(A) 20
(B) 30
(C) 40
(D) 10
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