The mean deviation from the mean for the set of observations $-1, 0, 4$ is
- A$\sqrt{\frac{14}{3}}$
- B$2$
- C$\frac{2}{3}$
- DNone of these
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If the mean deviation about the median of the numbers $a, 2a, 3a, \dots, 50a$ is $50$,then $|a|$ equals:
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