Step-by-step explanation
To get the mean absolute deviation, we will
Take each number in the data set, subtract the mean, and take the absolute value. Then take the sum of the absolute values.
Compute the mean absolute deviation by dividing the sum above by the total number of values in the data set.
For the given set

First, we have the mean as

Next, we calculate the deviation and the absolute values

From the above, we have the mean absolute deviation as

Finally, we divide the answer above by 5 (mean)
The mean absolute deviation is:

The answer is 10.56