Final answer:
To forecast the demand for the week of October 12 using a 3-week moving average, add the pints used in the past three weeks and divide by 3.
Step-by-step explanation:
To forecast the demand for the week of October 12 using a 3-week moving average, you need to calculate the average of the pints used in the past three weeks. According to the table, the pints used in the weeks of September 28, October 5, and October 12 are 378, 368, and 374, respectively.
To calculate the forecast, add these three values together and divide by 3: (378 + 368 + 374) / 3 = 373.33 pints. So, the forecasted demand for the week of October 12 using a 3-week moving average is approximately 373.33 pints.