Question

se stie ca media aritmetica a numerelor: 14, 29, 18, x, y este 72, iar media aritmetica a numerelor 60si 2x este 47, determinati numarul y

Answer 1

Ma=(14+29+18+x+y)/5=72
Ma=(60+2x)/2=47

60+2x=2x47
60+2x=94
2x=94-60
2x=34
x=17

14+29+18+x+y=72x5
61+x+y=360
61+17+y=360
y=360-78
y=282

verificare: (14+29+18+17+282) : 5 = 360 : 5 = 72