Question

calculate all the three of the mean deviation and corresponding coefficient of mean deviation x 21 25 27 32 41 46 50 55 and f 2 3 10 20 15 10 8 2
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Answer 1

$\tiny\tt \frac{x + 21 + 25 + 27 + 32 + 41 + 46 + 50 + 55}{9} = \frac{f + 2 + 3 + 10 + 20 + 15 + 10 + 8 + 2}{9} \\ \\ <strong><u>so</u></strong> \\ \\ \\ x + 297 = f + 70$