6)
d)
Pasul 1:
Calculam numarul elevilor:
Nota 4 .......... 2 elevi
Nota 5 .......... 4 elevi
Nota 6 .......... 5 elevi
Nota 7 .......... 6 elevi
Nota 8 .......... 4 elevi
Nota 9 .......... 2 elevi
Nota 10 .......... 1 elev
2 + 4 + 5 + 6 + 4 + 2 + 1 = 24 de elevi
Media clasei o calculam asa:
Adunam toate notele de la toti elevii
si impartim la numarul de elevi.
.
[tex]\displaystyle\bf\\m=\frac{4\times2+5\times4+6\times5+7\times6+8\times4+9\times2+10\times1}{24}\\\\m=\frac{8+20+30+42+32+18+10}{24}\\\\\textbf{Grupam notele pentru un calcul mai usor si sigur.}\\\\m=\frac{(8+42)+(20+30)+(32+18)+10}{24}\\\\m=\frac{50+50+50+10}{24}\\\\m=\frac{160}{24}~~~Simplificam~cu~8\\\\m=\frac{20}{3}\\\\m=6,6666....\\m=6,(66)\\\\\boxed{\bf~m=aprox.~6,66}\\\\\text{\bf~La medie se iau 2 cifre zecimale fara rotunjire la sutimi.}[/tex]
