Bonjour
[(8 x 2) + (14 x 5) + (16 x 6) + (15 x 7) + (12 x 8) + (10 x 10) + (6 x 11) + (7 x 14)] : (8 + 14 + 16 + 15 + 12 + 10 + 6 + 7)
= (16 + 70 + 96 +105 + 96 + 100 + 66 + 98) : 88
= 647 : 88
= 7,35
