Question

Calculate mean deviation about for the following data.

Class	0-10	10-20	20-30	30-40	40-50	50-60
Frequence	6	7	15	16	4	2

Answer 1

We have,

We know that,

$x=\frac{lowerlimit+upperlimit}{2}$

$i.e.=\frac{0+10}{2}=5$

Then,

Mean deviation $=\frac{{\sum }^{}fx}{{\sum }^{}f}$

$\overline{x}=\frac{1360}{53}=25.67$ ans.

Hence, this is the answer