Question

Find the mean deviation about the mean for the data in

$x_i$	$10$	$30$	$50$	$70$	$90$
$f_i$	$4$	$24$	$28$	$16$	$8$

Answer 1

$\begin{array}{c}xf{f}_1{x}_1-dm\left|x-{\overline{x}}_m\right|f\left(x-x_m\right)\\ 1044024.2597\\ 30247204.25102\\ 502814015.75441\\ 7016112035.75572\\ 90\underset{–}{8}\underset{–}{720}\underset{–}{55.75}\underset{–}{446}\\ N=8027401658\\ {\overline{x}}_m=\frac{2740}{80}=34.25\\ M.D=\frac{\sum f\left|x-x_m\right|}{N}\\ =\frac{1658}{80}=20.725\end{array}$