Q$1$ Choose the correct answer. For practical questions, justify your answers $(5$ marks$)$:

The regression equation is derived as: $Y=4+x.$ Then, the value of profit when Revent

million is:

A$.0$

B$.9$ million

C$.10$ million

D$.11$ million

Given forecast errors of $5,0,-4,$ and $3,$ what is the MAD?

A$.4$

B$.3$

C$.2\mathrm{.}5$

D$.2$