IN CLASS EXAMPLE $2$: WMA

Revisiting the customer arrival data in Table $1.$

Let $W_1=0\mathrm{.}50,W_2=0\mathrm{.}30,$ and $W_3=0\mathrm{.}20.$

a$.$ Use the weighted moving average method to forecast arrivals for month $5.$

b$.$ Given the number of patients that actually arrived $(805),$ what is the forecast error?

a$.$ If the actual number of arrivals in month $5$ is $805,$ compute the forecast for month $6.$

$\backslash$table$[[$Month$,$Customer arrivals$],[1,800],[2,740],[3,810],[4,790]]$