Bjr,
1) (19×3 + 15,5×2 + 18×4) ÷ (3+2+4) = 17,7777777.... ≅ 17,78
2) (19×3 + 15,5×2 + 18×4 + 17×3) ÷ (3+2+4+3) = 17,583333..... ≅ 17,58
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Bjr,
1) (19×3 + 15,5×2 + 18×4) ÷ (3+2+4) = 17,7777777.... ≅ 17,78
2) (19×3 + 15,5×2 + 18×4 + 17×3) ÷ (3+2+4+3) = 17,583333..... ≅ 17,58
Moyenne:
= 19x3+15,5x2+18x4/ 3+2+4
= 160/9
= 17,78
Nouvelle moyenne:
=19x3+15,5x2+18x4+17x3/ 3+2+4+3
=211/12
=17,58
Voilà normalement c’est bon