candidate: Income Index ( II ) formula_5Finally , the HDI is the geometric mean of the previous three normalized indices :< br > formula_6LE : Life expectancy at birth < br > MYS : Mean years of schooling ( Years that a 25 - year - old person or older has spent in schools ) < br > EYS : Expected years of schooling ( Years that a 5 - year - old child will spend with his education in his whole life ) < br > GNIpc : Gross national income at purchasing power parity per capita