Please give detailed answer for question 3,4 and 5

Insert answer here: Q4. In a brief sentence, explain 1 disadvantage of using the simple moving average over the weighted moving average. Insert answer here: Q5. Insert answer here: Q6. Determine the forecasted demand based on a 3 point simple moving average for weeks 4-10. NOTE: You will fill in the only the cells in grey. \begin{tabular}{|c|c|c|} \hline Week & Actual Demand & 3 Period \\ \hline 1 & 789 & \multirow{}{*}{} \\ \hline 2 & 872 & \\ \hline 3 & 983 & \\ \hline 4 & 382 & \\ \hline 5 & 661 & \\ \hline \end{tabular}