Use the Image below for the next TWO questions

$1.$What is the Mean Squared Error $($MSE$)$ for the three$-$period weighted moving average forecast as at period $15?($Weights are t$=0\mathrm{.}1,$ t$-1=0\mathrm{.}4$ and t$-2=0\mathrm{.}5)$

$2.$ What is the forecast for period $16$ using the four$-$period weighted method? $($Weights are t$=0\mathrm{.}3,$ t$-1=0\mathrm{.}2,$ t$-2=0\mathrm{.}3$ and t$-3=0\mathrm{.}2)$