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.
Ghost ants require much moisture and can be the cause of making them indoor pests in drought seasons. It has been thought that a ghost ant picked its name up after being identified as having a transparent body except for its head.Determining a ghost ant from other species of ants is easy.ost likely your kitchen may have a nest of ghost ants nearby. As unpleasant as they are, luckily they do not spread pathogens that make humans sick. In fact these ants are extremely common in Florida homes. Notoriously known as ghost ants, you may encounter some residents referring to them as sugar ants.