Răspunsuri

2014-06-19T17:17:25+03:00
(1*11+2*12+3*13+4*14+5*15)/ 1+2+3+4+5=
205/15=13.6 media de varsta
2014-06-19T17:23:04+03:00
(1×11+2×12+3×13+4×14+5×15)÷ (1+2+3+4+5)= 205÷15 = 13.6