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.
Dorymyrmex are common ants in the Sonoran Desert. Two species are common in Tucson, D. insanus and D. bicolor. These ants are sometimes called cone ants because they have a distinctive cone on their bodies in front of the petiole. Workers have relatively long and thin bodies.