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 platypus is sometimes described as a living fossil because of this ancient lineage and its combination of mammalian and reptilian features. Aboriginal legend Return to Platypus Page. According to Aboriginal legend, the first platypus were born after a young female duck mated with a lonely and persuasive water-rat.The duck's offspring had their mother's bill and webbed feet and their father's four legs and handsome brown fur.he Fossil Record Return to Platypus Page. Based on a fragment of lower jaw found in opal deposits at Lightning Ridge in New South Wales, a type of ancestral platypus (Steropodon galmani) existed alongside the dinosaurs about 110 million years ago.