If sum of aquares of items =2,430, arithmctic mean =7, and number of items=12, find the coefficient of variation.

Standard deviation of data is 12 and mean is 72 then coefficient of variation is

In a series of observations , SD is 7 and mean is 28 . Find the coefficient of variation .

If the sum of the squares of the differences of the 10 values of a variable from its mean 50 be 250, find the coefficient of variation.

Arithmetic mean of these items 5,7,9,15,20 is:

The arithmetic means of two distributions are 20 and 35 and their S.D. are 5 and 7 respectively. Find their coefficient of variation.