Use the table below to calculate the Mean Squared Error $($MSE$)$ for the following simple naive forecast. You may use Excel. The final answer should be rounded to two decimal points $($e$.$g$.,2\mathrm{.}67$ not $2\mathrm{.}6666666666).$ However, do not round any intermediate calculations.

$\backslash$table$[[$Period$,$Actuat $7,$Simple Native Forecast of X$,$Se$.$ Error$],[1,274,,],[2,704,274,],[3,204,294,],[4,20\mathrm{.}7,20\mathrm{.}4,],[5,285,207,],[6,21\mathrm{.}3,285,],[1,,213,$MSE$]]$