When the frequency curve is more peaken than normal curve it is called 

(a) Leptokurtic 

(b) Platy 

(c) Mesokurtic 

(d) None

Measures of dispersion are statistical devices to measure the —– in a series

(a) Variability 

(b) Convertibility 

(c) Flexibility 

(d) None

— are devices for measuring differences in the magnitude of a group of related variables

(a) Index numbers 

(b) Time series 

(c) Standard deviation 

(d) Mean

The most commonly used relative measure of dispersion 

 (a) Coefficient of variation 

(b) Q.D 

(c)S.D 

(d)None

The most important measure of dispersion

(a) Range 

(b) Mean deviation 

(c) Standard deviation 

(d) Quartile deviation

The formula of Q.D 

 (a) (Q3-Q1⁾/2 

(b) (Q2-Q3)/2 

(c) (Q2-Q1⁾/2 

(d) none

— is the difference between highest and lowest values in a series 

(a) Range 

(b) Mean 

(c) Dispersion 

(d) None

Measures of dispersion are called averages of —– order 

(a) First 

(b) second 

(c) Third 

(d) None 

Graphical method of measuring variability is first used by 

(a) Max O Lorenze  

(b) Carl Pearson 

(c) Spiegel 

(d) Fishers

If the value of a series are equal , S.D is 

(a) Zero 

(b) One 

(c)Two 

(d)None