Respuesta :

discipulus

Answer:

[tex] \frac{5 + 8}{2} = 6.5 \\ \frac{9 + 12}{2} = 9.5 \\ \frac{13 + 16}{2} = 14.5 \\ mean = \frac{ \sum \: xf}{n} \\ = \frac{(3 \times 6.5) + (5 \times 9.5) + (1 \times 14.5)}{(3 + 5 + 1)} [/tex]