Question

Media aritmetica a 4 numere este 30 iar media aritmetica a 6 numere este 70. Aflati media aritmetica a celor 10 numere

Answer 1

30=(a+b+c+d)/4
a+b+c+d=120
70=(x+y+z+m+n+p)/6
x+y+z+m+n+p=420
ma=(a+b+c+d+x+y+z+m+n+p)/10=(120+420)/10=540/10=54

Answer 2

(a+b+c+d):4=30
a+b+c+d=30•4=120
(a+b+c+d+e+f):6=70
a+b+c+d+e+f=70•6=420
a+b+c+d+e+f+a+b+c+d=420+120=540
media aritmetica=540:10=54