Répondre :
Il y a 14 garçons soit m leur taille moyenne
(20.167 + 15.m)/35 = 170 => (20.167 + 15.m) = 170.35 =>15m = 170.35 - 20.167
=> 15m = 2610 => m = 174 cm
(20.167 + 15.m)/35 = 170 => (20.167 + 15.m) = 170.35 =>15m = 170.35 - 20.167
=> 15m = 2610 => m = 174 cm