Week $1=4000$

Week $2=6000$

Week $3=8000$

Week $4=10000$

Week $5=12000$

Week $6=$ Predict using the weighted moving average forecast $(0\mathrm{.}4,0\mathrm{.}3,0\mathrm{.}3)$

Last Period Forecast:

$F_{t+1}=D_t$

where $F_{t+1}=$ forecast for the next period, $t+1$ and $D_t=$ demand for the current period, $t$

Moving Average Forecast

$F_{t+1}=\frac{{\displaystyle \underset{i=1}{\overset{n}{}}}{D}_{t+1-i}}{n}$

where $F_{t+1}=$ forecast for the next period, $t+1$

and $D_{t+1-i}=$ actual demand for the period, $t+1-i$

and $n=$ number of most recent demand observations used in the forecast and $W_{t+1-i}=$ weight assigned to the demand in perio $d,t+1-i$

$10200$

$9800$

$8000$

$14000$

$10000$