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.
Carpenter ants are among the largest ants in the United States, ranging from 3.4 to 13 mm long. The most common color is black, but some species have reddish or yellowish coloration. Workers have large mandibles. Carpenter ants reside both outdoors and indoors in moist, decaying or hollow wood.