If you made a forecast for Week $18,$ based on a $3$ week weighted moving average, with oldest data to most recent data weighted $0\mathrm{.}20,0\mathrm{.}30,$ and $0\mathrm{.}50,$ respectively, how much would your forecast be different from the actual jobless claims?

$\backslash$table$[[$Week$,$Tobless claims$],[,($in thousands$)],[1,400],[2,393],[3,392],[4,396],[5,404],[6,385],[7,368],[8,366],[,]]$