$1$ Q$1.$ use the wighted moving average method to find the forecast value of Nov $(6\mathrm{.}5$ points$),$ also find MAD $(6$ points$)$

$$

$4n$

$n$

$3$

Time Demand forecast

w$1$

$0\mathrm{.}1$

$0\mathrm{.}4$

MAD

$.$

$8$

$9$

$10$

$11$

$12$

$13$

$14$

$14$

$15$

$15$

$16$

$16$

$17$

$17$

$18$

$18$

$19$

$19$