Question

Noteaza la teza de matematica obtinute la elevii unei clase a VIII-a sunt date in tabelul urmator
Nota 4 5 6 7 8 9 10
Numar de elevi 3 5 5 4 2 4 2
Media clasei la teza este

Answer 1

$\frac{3 \times 4 + 5 \times 5 + 5 \times 6 + 4 \times 7 + 2 \times 8 + 4 \times 9 + 2 \times 10}{3 + 5 + 5 + 4 + 2 + 4 + 2} = \\ \frac{12 + 25 + 30 + 28 + 16 + 36 + 20}{25} = \\ \frac{167}{25} = 6.68$