It is "probability".
No, it is a statistical measure of the spread of a distribution of some variable.
Statistics is the study of how probable an observed event is under a set of assumptions about the underlying probability distribution.
It is a descriptive statistical measure used to measure the shape of the curve drawn from the frequency distribution or to measure the direction of variation. It is a measure of how far positively skewed (below the mean) or negatively skewed (above the mean) the majority (that's where the mode comes in) of the data lies. Useful when conducting a study using histograms. (mean - mode) / standard deviation. or [3(Mean-Median)]/Standard deviation
It is one of the most important constants in mathematics. It is central to trigonometry and geometry but also has very many uses in calculus and probability.
Boolean Algebra is the study of the algebra of logic whilst Mathematical logic is a way of applying Boolean algebra. Other applications include set theory, digital logic and probability.
It is called PROBABILITY.
An acceptable standard deviation depends entirely on the study and person asking for the study. The smaller the standard deviation, the more acceptable it will be because the less likely there are to be errors.
The study of population change and distribution is demography.
Scientists who study water distribution are typically referred to as hydrologists. They study the movement, distribution, and quality of water on Earth.
Geometry is the mathematical study of shapes and space.
Economics is the study of wealth and its distribution.