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.
Venom is not the only feature which makes the platypus a unique mammal. Amongst the most noticeable are its duckbill and unique orifice for both excretion and reproduction - a reptilian trait. The first specimen of a platypus was sent to England in 1798. No one could make...bill or tail of it.