The marks obtained by 10 students in a Statistics test are...

$\because 15,18,19,21,24,32,35,41,47,50$ Largest 5 observations are $32,35,41,47,50$$\begin{aligned} \text{ Mean } & =\mu=\frac{32+35+41+47+50}{5} \\ & =\frac{205}{5}=41 \end{aligned}$Mean deviation $=\frac{\Sigma\left|x_i-\mu\right|}{n}\begin{aligned} & =\frac{|32-41|+|35-41|+|41-41|+|47-41|+|50-41|}{5} \\ & =\frac{9+6+0+6+9}{5}=\frac{30}{5}=6\end{aligned}$$$