Standard deviation from ungrouped data. The standard deviation is a summary measure of the differences of each observation from the mean. If the differences themselves were added up, the positive would exactly balance the negative and so their sum would be zero. Consequently the squares of the differences are added.
A pissant, also seen as piss ant or piss-ant, refers to a specific type of ant. The word is also used as a pejorative noun or adjective, indicating insignificance.he original pissant is any of a certain group of large ant species, commonly called wood ants, that make mounded nests in forests throughout most of Europe.
Ants are social insects from the Formicidae family. These tiny creatures can be really nasty and pain caused due to an ant bite can last for days. Furthermore, ants are a regional insect which means that a particular species of ants may be abundant in one region and nonexistent in another region. Here is a list of 10 most dangerous species of ants in the world with a brief description of each of the ant species included in the list.