Răspunsuri

2014-02-12T21:49:13+02:00
X:15/2=medie aritm
medie aritm=(6.2+16.3)/2
medie aritm=22.4/2=11.2

deci
x:7.5=11.2
x=11.2*7.5
x=84
1 1 1