Question

As notas de um aluno nas diferentes matérias foram :
5,5 6,0 8,0 6,0 7,8 6,5 4,0 9,2 4,6
Qual é a media aritmética dessas notas.

Answer 1

$\overline{X}=\frac{\sum\limits_{k=1}^{n}X_k}{n}$

$\overline{X}=\frac{5.5+6.0+8.0+6.0+7.8+6.5+4.0+9.2+4.6}{9}$

$\overline{X}=\frac{57.6}{9}$

$\boxed{\boxed{\overline{X}=6.4}}$