Question

Rezultatele obinute de elevii unei clase la un test sunt : 3 copii-au luat 4 , 4 copii-au luat 5 , 5 copii -au luat 6 , 2 copii-au luat 7 , 6 copii -au luat 8 , 3 copii -au luat 9 , 2 copii au luat 10....Aflati media clasei...:\

Answer 1

(3×4+4×5+5×6+2×7+6×8+3×9+2×10)÷25=(12+20+30+14+48+27+20)÷25=171÷25=6.84~7

Answer 2

3x4+4x5+5x6+2x7+6x8+3x9+2x10=
=12+20+30+14+48+27+20=
=171(suma tuturor notelor)

171:(3+4+5+2+6+3+2)=
=171:25=
=6.84 (media clasei)