Question

Calculati media ponderata a numerelor:
 1/2 ;1,3(8) si 0,(3) cu ponderile 1,9 si respectiv 6

Answer 1

1,3(8)=(138-13)/90=125/90=25/18
0,(3)=3/9=1/3

[(1/2)x1+(25/18)x9+(1/3)x6]/(1+9+6)=
=(1/2+25/2+2)/16=
=(26/2+2)/16=
=(13+2)/16=15/16