Calculate the mean deviation about the mean of the set of first `n` natural numbers when `n` is odd natural number.

Explanation

To calculate the mean deviation about the mean of the set of the first `n` natural numbers when `n` is an odd natural number, we can follow these steps:

### Step 1: Calculate the Mean of the First `n` Natural Numbers
The first `n` natural numbers are: 1, 2, 3, ..., n.

The formula for the sum of the first `n` natural numbers is:
\[
S_n = \frac{n(n + 1)}{2}
...