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.
Some people even refer to them as 'piss ants'. However, many types of ants smell bad when you smash them. They are also known as Sugar Ants, they get that name because they readily feed on sugar, pop, syrup, and other sweets. In nature these ants actually eat other insects and insect secretions. Aphids make a sticky 'sap' when they eat the leaves of bushes and trees.