$\backslash$table$[[$UESTION $2,\backslash$table$[[$Consider the following demand figures for the $7$ most recent periods$],[$a$.$ Compute the Forecast for the next period using a Average of All Historical Data$--$ use FORMU$]]],[$Period $(t),$DEMAND,$\backslash$table$[[$Forecast$],[$Avg All Hist Data$]],$Optional $-$ to show intermediate steps in columns D to F$],[\backslash$table$[[$Absolute$],[$Forecast Error$]],\backslash$table$[[$Absolute$],[$Percentage$],[$Forecast Error$]],\backslash$table$[[$Squared$],[$Forecast Error$]]],[1,33\mathrm{.}00,,,,],[2,36\mathrm{.}00,,,,],[3,39\mathrm{.}00,,,,],[4,45\mathrm{.}00,,,,],[5,55\mathrm{.}00,,,,],[6,46\mathrm{.}00,,,,],[7,56\mathrm{.}00,,,,],[,$d $8$ Forecast,,,,$]]$

b$.$ Calculate the following Forecast Error measures for this method

Use FORMULAS; just typing values will not earn the score

Mean Absolute Deviation $($MAD$)$