How to Calculate the Median. The median is the middle score of a distribution. Consider this set of numbers: 5, 7, 9, 9, 11. Since you have an odd number of scores, the median would be 9. Now, what happens when you have an even number of scores so there is no single middle score. Consider this set of numbers: 1, 2, 2, 4, 5, 7. Since there are an even number of scores, you need to take the average of the middle two scores.
The platypus (Ornithorhynchus anatinus) also known as the duck-billed platypus is a semiaquatic egg-laying mammal endemic to eastern Australia, including Tasmania.
The amazing platypus, the egg-laying mammal. The platypus is one of the most fascinating species on our planet. Not only because this mammal lays eggs, is venomous and has a bill like a duck, but because it is the most evolutionary distinct mammal that exist today. A beautiful photo of a swimming platypus. Photo by Peterarnold/BIOS.