The mean absolute deviation of the number of books is 1.84
<h3>How to determine the mean absolute deviation?</h3>
The dot plot of the number of books is in the attached figure.
From the figure, we have:
x      f
1       1
2      2
3      2
4      3
5      1
6     2
7     3
8     1
Start by calculating the mean using:

So, we have:

Evaluate the sum and products

Divide

The mean absolute deviation is then calculated as:

So, we have:

Evaluate the absolute difference

Evaluate the sum of products

Divide

Hence, the mean absolute deviation of the number of books is 1.84
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