TS EAMCET 4 May 2018 Shift 1 Solved Paper

The expression for mean is given by,
x=

x1+x2+....+xn

n

nx=x1+x2+.....+xn
(x1−x)+(x2−x)+.....+(xn−x)=0

n

∑

i=1

(xi−x)=0
Variance is the mean of the square of deviation from mean.
Mean deviation is of observation is mean of the absolute deviations from any measure of central tendency.
And,
Coefficient of variation is used to find the homogeneity of given two series.
Therefore, the correct option is (3).