$2-$ Given the following demand pattern. Forecast the demand for period $6$ by:

period

demand

$\backslash$table$[[,22],[2,26],[3,30],[4,28],[5,34]]$

a$)$ The Arithmetic Average technique.

b$)$ The weighted moving average where $n=2.$ The weights are $8$ and $2,$ where $8$ is for the most recent data.

c$)$ Which one of the two is preferable based on the MAD method.