
The way I learnt it in school (complicated slightly by the fact that it was all in Swedish so somewhat uncertain about the terms) an AVERAGE is where you add all the figures together, divide it by the number of figures, and take the result. But a mean is the number in the middle of all numbers, so therefore more accurate. I.e. say you have 3 hip scores, one of 9, one of 20 and one of 100. The average of them would be 43 (9+20+100 divided by 3). But the MEAN would be 20. The fact that you have just one (in this simple example) really high number has increased the average in total, even though there are more low numbers than high.
By kayc
Date 23.03.09 21:07 UTC
to calculate the Median
3, 13, 7, 5, 21, 23, 39, 23, 40, 23, 14, 12, 56, 23, 29
If we put those numbers in order we have:
3, 5, 7, 12, 13, 14, 21, 23, 23, 23, 23, 29, 39, 40, 56
There are fifteen numbers. Our middle number will be the eighth number:
3, 5, 7, 12, 13, 14, 21, 23, 23, 23, 23, 29, 39, 40, 56
The median value of this set of numbers is 23.

Ok, for example, one dogs mean progeny score was 13:2, that is very uneven isn't it?
If that is the mean score, does it also mean that all the scores were uneven, or maybe there was one score that was VERY bad on one side?