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.
An Introduction to Army Ants. There are over 200 different known species of army ant. Eciton burchellii is one of the most studied species, and has typical army ants characteristics. They are very aggressive and can tackle among some of the largest prey. They rest in temporary nests made entirely of ants, also known as a âbivouacâ. The queen ant and her brood stay safe in the centre of the mass of ants.