Coefficient of Variation

The coefficient of variation and standard deviation of an ungrouped data are 60 and 21 respectively. If 15 is added to every observation of the data, then the coefficient of variation of the new data is

The coefficient of variation is defined as sigma//overset-x that is the standard deviation divided by the mean value. Find the coefficient of variation c.v. for each of the following set of observations. 2,3,4,2,5,7,8,9

Coefficients of variation of two distribution are 15 and 20 and their means are 20 and 10 respectively. If their standard deviations are sigma_1 and sigma_2 then

(a)Coefficient variation is computed by