Write in the correct values for the various letters shown in this chart. Use July and August when you calculate MAM. \begin{tabular}{|c|c|c|c|c|c|} \hline PERIOD & ACTUAL & FORECAST & ERROR & ERROR | & |ERROR | 2 \\ \hline JAN & 103 & 106 & -3 & D & 9 \\ \hline FEB & 114 & A & 3 & 3 & 9 \\ \hline MAR & 101 & 105 & -4 & 4 & 16 \\ \hline APR & 107 & 103 & C & 4 & 16 \\ \hline MAY & 110 & 112 & -2 & 2 & 4 \\ \hline JUNE & B & 110 & -1 & 1 & 1 \\ \hline JULY & 111 & 112 & -1 & 1 & 2 \\ \hline AUG & 107 & 110 & -3 & 3 & 9 \\ \hline \end{tabular}