Daily high temperatures in st. Louis for the last week were as follows: 33,33,38,36,43,23,28(yesterd

Daily high temperatures in st. Louis for the last week were as follows: 33,33,38,36,43,23,28(yesterday).

Calculate the mean absolute deviation based on a 3 day moving average?

In my text book it say that you need the actual forecast however, the problem never gives me the real temp thus creating a problem to calculate mean absolute deviation? any help would be greatly appreciated