Mean absolute deviation = 2.66
Solution:
Step 1: Calculate the mean of the given observation.



Mean = 4.5
Step 2: Calculate the distance between each data point and mean.
The image of this step is attached below.
Step 3: Add distance together.
0.5 + 2.5 + 4.5 + 1.5 + 3.5 + 3.5 = 16
Step 4: Divide the sum by the number of data points.
Mean absolute deviation = 
Hence, Mean absolute deviation = 2.66