Keyword Analysis & Research: what does sigma represent in maths

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what does sigma represent in maths	1.94	0.1	6589	67	34
what	0.63	0.6	5080	100	4
does	1.7	0.9	8742	2	4
sigma	1.77	0.7	700	52	5
represent	0.37	1	814	48	9
in	0.75	0.2	2773	63	2
maths	1.35	1	4282	75	5

Keyword	CPC	PCC	Volume	Score
what does sigma represent in maths	0.21	0.8	8028	38