Example: Find the median of the following numbers. a) 6, 5, 2, 8, 9, 4. b) 2, 1, 8, 3, 5, 8.

There are 6 numbers in the set, so $n = 6$.

Since $n$ is an even number, the median is the average of the two middle values. These are the values at positions $\frac{n}{2}$ and $\frac{n}{2} + 1$.
The positions are $\frac{6}{2} = 3$ and $\frac{6}{2} + 1 = 4$.
So, we need to find the 3rd and 4th values in the ordered list.

The ordered list is: 2, 4, 5, 6, 8, 9
The 3rd value is 5.
The 4th value is 6.

The median is the average of the 3rd and 4th values.

The median for part a) is $\boxed{\text{5.5}}$.

There are 6 numbers in the set, so $n = 6$.

Since $n$ is an even number, the median is the average of the two middle values. These are the values at positions $\frac{n}{2}$ and $\frac{n}{2} + 1$.
The positions are $\frac{6}{2} = 3$ and $\frac{6}{2} + 1 = 4$.
So, we need to find the 3rd and 4th values in the ordered list.

The ordered list is: 1, 2, 3, 5, 8, 8
The 3rd value is 3.
The 4th value is 5.

The median is the average of the 3rd and 4th values.

The median for part b) is $\boxed{\text{4}}$.