MEDIAN or 50th Percentile
According to Wikipedia the median or 50th percentile is the numerical value separating the higher half of a data sample, a population, or a probability distribution, from the lower half. Some examples:
| Set | Median / 50th percentile |
| 1,2,3,4,5 | 3 |
| 1,2,3,3,4,5 | 3 |
| 1,2,3,4,4,5 | 3,5 |
| 1,2,3,3,4,4,5 | 3 |
| 1,2,3,3,4,4,5,5 | 3,5 |
In this example you see that if the set contains an even number of members the median is the average between the numbers left and right from the centre.
