How to calculate the coefficient of variation of per capita income ?

Hy, I have datas of some countries (gdp per capita) and I want to know how to calculate the coefficient of variation of per capita income.Thanks or:H

Hy, I have datas of some countries (gdp per capita) and I want to know how to calculate the coefficient of variation of per capita income.

Thanks

or:Hy, I have datas of some countries (gdp per capita) and I want to know how to calculate the coefficient of variation of per capita income.Thanks

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