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 feed on protein and greasy foods such as nuts, meats, cheese, peanut butter and sweets. Because worker thief ants are small enough to enter food packaging, they can become a nuisance in the kitchen. Outside, thief ants forage for dead insects and rodents.