Sales $($in thousands$)$ of the new Thorton Model $506$ convection oven over the eight$-$week period since its introduction are shown in the following table.

Week Sales

$118\mathrm{.}7$

$221\mathrm{.}3$

$325\mathrm{.}3$

$422\mathrm{.}3$

$524\mathrm{.}5$

$619\mathrm{.}3$

$721\mathrm{.}8$

$823\mathrm{.}7$

What is the MSE using

$=0\mathrm{.}6?$

$7\mathrm{.}71$

$8\mathrm{.}82$

$10\mathrm{.}29$

$12\mathrm{.}34$