how do we coefficient of variation in discrete series

1.Take one value from items (

*X*) as assumed mean that is 'A' and calculate deviation

*dx*=

*X-*A.

2. Muliply frequency with

*dx*then we get

*fdx*and add all of them to get .

3. Again multiply

*fdx*by

*dx*so we will have and add all of them to get .

4. Now, calculate mean by A + (

*N*is summation of frequency )

5. Calculate standard deviation by

6. Cofficient of variation =

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