Question

A tabela abaixo mostra as notas dos alunos de uma classe de Ensino Médio em uma disciplina.

3        1,0

9         3,0

16        5,0

8          7,0

4           9,0

 

Calcule a media aritmetica ponderada.

Answer 1

1,0*3 + 3,0*9 + 5,0*16 + 7,0*8 + 9,0*4
-------------------------------------- =
3 + 9 + 16 + 8 + 4

3,0 + 27,0 + 80,0 + 56,0 + 36,0
-----------------------------=
40

110 + 92
---------=
40

202:2----101
------ = -------- = 5,05 ( MEDIA )
40:2------20

Answer 2

$\frac{3 x 1 + 9 x 3 + 16 x 5 + 8 x 7 + 4 x 9}{3 + 9 + 16 + 8 + 4}$
$\frac{3 + 27 + 80 + 56 + 36}{40}$
$\frac{202}{40}$ = 5,05