Suppose the actual sales and the forecasted or smoothed sale

Suppose the actual sales and the forecasted, or smoothed sales, for the past 5 months have been:

Actual

Smoothed

54.4

76.8

54.4

75.5

72.3

53.2

74.8

39.2

57.6

What is the Mean Absolute Error of the smoothed series? (please show your work round your answer to 1 decimal place)