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.
Worker ants are sterile or non-reproductive female ants that tend the queen, the brood (eggs, larvae and pupae), and forage for food. Most species produce winged ants, called reproductives, during certain times of the year. These are male and female ants leaving the nest to mate and establish new colonies.ize of these castes of ants varies with species. Female reproductive Texas leafcutting ants can have bodies about 20 mm in length. Harvester ant workers range from 5 to 9 mm and reddish brown to yellow or black, while red imported fire ants workers range from 1.5 to 4 mm and reddish brown with a darker abdomen.