Forecast accuracy $(11$ ?points $)$

a $.$ ?Calculate the mean forecast error $($ bias $)$ ?for months $7-12$ ?of a weighted average

forecast with prior months weighted $\mathrm{.}45,\mathrm{.}35$ ?and $\mathrm{.}2$ ?respectively. What does the

error tell you about this forecast? $(8$ ?points $)$

b $.$ ?What is the MAPE for the months $7-12$ ?of this same forecast $($ weighted average $)?$

What does this metric tell you about this forecast? $(3$ ?points $)$