Answer:
The mean absolute deviation is 16.
Explanation:
For a set of N values:
{x₁, x₂, ..., xₙ}
The mean value is:

And the mean absolute deviation is:

In this case, we have a set of 4 values, {-32, 9, 11, 12}
The first thing we need to do is find the mean, it will be equal to:

Then the mean absolute deviation will be:

The mean absolute deviation is 16.