Use the following problem statement to answer questions $1-5.$

Demands for a newly developed salad bar at the PQR restaurant for the first four months of this year are shown in the table below. Round to three decimal places. $[$Note: Simple moving average method: $Ft+1=\frac{Dt+Dt-1+Dt-2+\text{d}\text{o}\text{t}\text{s}+Dt-n+1}{n}.$ Weighted moving average method: $Ft+1=W1D1+W2D2+$dots$+WnDt-n+1.$ Exponential smoothing method: $Ft+1=Ft+a(Dt-Ft)$