Final answer:
The question pertains to calculating a weighted moving average in mathematics, which is a forecasting measure. However, the weights and demand data are missing, making it impossible to provide a forecast for the week of October 12.
Step-by-step explanation:
The subject of the student's question is Mathematics. Specifically, the question pertains to the calculation of a weighted moving average, which is a statistical measure used in forecasting. However, the question is incomplete as it does not provide the actual weights to use for the moving average or the past demand data needed to calculate the forecast. To calculate a 3-week weighted moving average, you typically multiply each week's demand by its given weight and sum the results. The most recent week's demand is usually multiplied by the highest weight. Without the specific weights and demand values, we cannot calculate the forecasted demand for the week of October 12.