sigma

Ρρ $\longleftarrow$ 18 $\longrightarrow$ Ττ

Pronunciation

IPA ^(key): /ˈsɪɡmə/
Audio (US) (file)

Noun

Singular
sigma

Plural
sigmas

sigma

Eighteen letter of Greek.
Σσ, and in the word last position, writes as ς.
Standard deviation,has formula $:={\displaystyle \sigma ={\sqrt {{\frac {1}{n}}\sum _{\iota =1}^{n}(a_{\iota }-{\bar {x}})^{2}}}}$ the average symbol ${\bar {x}}$ often writes as μ

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