Definition, Meaning & Synonyms

sigma

noun

/ˈsɪɡ.mə/

Definition

The 18th letter of the Greek alphabet, often used in various mathematical and scientific contexts.

Examples

The sigma notation is used to denote the sum of a series: ∑_{i=1}^{n} i.
In statistics, a smaller sigma indicates that the data points are closer to the mean.
He uses the symbol sigma in his mathematics presentations to explain sums.

Meaning

In mathematics, ‘sigma’ commonly represents summation, which is the process of adding a sequence of numbers. In statistics, it signifies the standard deviation, a measure of the amount of variation or dispersion in a set of values.