CG,

It is impossible for the median of a set of whole numbers to be anything other than a whole number. I think you've confused mean with median.

[stat mode]

Here's an example. The set of numbers (3, 4, 5, 6, 8, 25).

Mean: (3+4+5+6+8+20) / 6 = 8.5

Median: 5 (I was taught in a even-numbered set, to take the number left of the mid-point).

The median is not the average. It is the number in the middle of the set listed in ascending order. It tends to reduce the impact of outliers - see the example above. The number 25 is well above the norm, and this causes the mean to be pulled higher. The median is more towards the general range of numbers.

[/stat mode]

Now, assuming you mean the mean, you simply pick one and remain constant. This would go in the book where the calculation for the census is detailed.

-- Ravensfire