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a fost răspuns

La un test,elevii clasei a 8a au obt urmatoarele note
Nota 3 4 5 6 7 8 9 10
Nr elevi 2 4 4 5 5 5 2 3
Media clasei a fost.......

Răspuns :

Anetud
3x2+4x4+5x4+6x5+7x5+8x5+9x2+10x3=
=6+16+20+30+35+40+18+30=
=22+50+75+48=
=72+123=
=195
2+4+4+5+5+5+2+3=
=6+9+10+5=
=15+15=
=30 elevi

195:30=6.50 media clasei
Camela
(2×3+4×4+4×5+5×6+5×7+5×8+2×9+3×10)÷30 =(6+16+20+30+35+40+18+30)÷30=195÷30=6,5

195,0|_30_
180 | 6,5
=150 |
150 |
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Răspuns: Ma=6,5.( media clasei)