Marianne Kramer, the owner of Handy Man Rentals, rents carpet cleaners to contractors and walk-in 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 cleaners. Data for the last 10 weeks are shown here.

a. Prepare a forecast for weeks 6 through 10 by using a 4-week moving average. What is the forecast for week 11?
b. Calculate the mean absolute deviation as of the end of week 10.

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WeekRentals Week entals 15 16 24 18 23 20 24 27 18 16 10