Measures of Dispersion

Positive

Zero

Negative

Equal to

M.D(X)

M.D(X) ± b

a M.D(X)

M.D(Y) + M.D(X)

140

143

146

70

Mean

Mode

Median

Zero

Small

Large

Normal

Symmetrical

Variance

Standard deviation

Coefficient of variation

Coefficient of standard deviation

Standard deviation

Coefficient of mean deviation

Mean deviation

Variance

Coefficient of kurtosis

Absolute measures of dispersion

Quartile deviation

Relative measures of dispersion

12.43

10.43

14.43

16.43

Interquartile range

Quartile deviation

Mean deviation

Standard deviation