1)
0.49% -> 12 ans
1.21% -> 13ans
10.02% -> 14ans
18.31% -> 15ans
25.40% -> 16ans
26.55% -> 17ans
18.02% -> 18ans
2) (9055*0.49)/100 = 44 -> 12ans
(9055*1.21)/100 = 109 -> 13ans
(9055*10.02)/100= 907 -> 14ans
(9055*18.31)/100= 1657 -> 15ans
(9055*25.40)/100= 2299 -> 16ans
(9055*26.55)/100= 2404 -> 17ans
(9055*18.02)/100= 1631 -> 18ans
3) age moyen= ((44*12)+(109*13)+(907*14)+(1657*15)+(2299*16)+(2404*17)+(1631*18))/9055
= 16
L'age moyen est de 16ans.
