Question

Media aritmetica a trei fractii zecimale este 2,25 , iaredia aritmetica a altor patru fractii zecimale este 3,50 .Aflati media aritmetica a celor 7 fractii.

Answer 1

(a+b+c):3=2.25=>a+b+c=6.75
(d+e+f+g):4=3.50=>d+e+f+g=14
(a+b+c+d+e+f+g):7=(6.75+14):7=2.9642857143 :)

Answer 2

(a+b+c)/3 = 2,25
(d+e+f+g)/4 = 3,50
(a+b+c+d+e+f+g)/7 =?
a+b+c = 3 x 2,25 = 6,75
d+e+f+g = 4 x 3,50 = 14
a+b+c+d+e+f+g = 6,75 + 14 = 20,75
(a+b+c+d+e+f+g)/7 = 20,75/7 = 2,96(428571)