Given the following forecasting data, using trend projection, the $(x-\stackrel{}{x}{)}^2$ is $$

Month Period Demand $($in

Thousands$)$

$\backslash$table$[[$April$,1,19],[$May$,2,20],[$June$,3,18]]$

July $4019$

August $5,17$

$-5$

$0$

$10$