If the mean deviation about median for the numbers \( 3,5,7,2 \mathrm{k} \), \( 12,16,21,24 \), ...

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If the mean deviation about median for the numbers \( 3,5,7,2 \mathrm{k} \), \( 12,16,21,24 \), arranged in the ascending order, is 6 then the median is
(a) 11.5
(b) 10.5
(c) 12
(d) 11
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