Question

La un test s-au obtinut notele : 2 note 3... 1 nota de 4... 3 note 5 .. 4 note de 6 ... 3 note de 7 ..5 note de 8 ... 5 note de 9 ...2 note de 10 .
Media clasei este ?

Answer 1

Calculam cati copii au participat (cate noste au fist date):

2+1+3+4+3+5+5+2=25

Calculam suma notelor:

2×3+4+3×5+4×6+3×7+5×8+5×9+2×10=175

Iar acum, media clasei:

175:25=7

Answer 2

3×2 =6
1×4=4
3×5=15
4×6 = 24
3×7=21
5×8=40
5×9=45
2×10=20
20+45+40+21+24+15+4+6=65+51+39+10=
116+ 49 =
166
166÷8=
26 ÷6 =
6 - media clasei
Daca vrei sa scri cum am zis eu