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.
Thief ants, also commonly called grease ants, seek high-protein foods like meats, fats, and grease. They will rob both food and brood from other ants, thus the name thief ants. Thief ants are quite tiny, measuring less than 2 mm long. Thief ants will invade homes in search of food, but usually nest outdoors.