The owner of a computer store rents printers to some of her preferred customers. She is interested

Question:

The owner of a computer store rents printers to some of her preferred customers. She is interested in arriving at a forecast of rentals so that she can order the correct quantities of supplies that go with the primers. Data for the last 10 weeks are shown here.

a. Prepare a forecast for weeks 6 through 10 by using a live-week moving average. What is the forecast for week II?
b. Calculate the mean absolute deviation as of the end of week10.