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Variance — Edexcel GCSE Statistics Definition | GradeGen

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Statistics
Key terms
Variance

GCSE Statistics · key term

Variance

Definition

The square of the standard deviation, written $\sigma^2$ . Its units are the square of the original measurement units.

Used by Edexcel

How each exam board covers it

Edexcel GCSE Statistics · 1ST0

Specification 3p.12 · Paper 1, Paper 2

Revise: Characteristics of a normal distribution

Edexcel Statistics past papers

Exam tips

1
In $N(\mu,\sigma^2)$ , the second number is the variance, not the standard deviation. Take its square root to find the standard deviation.

Related key terms

Continuous quantity
Mean
Median
Mode
Normal distribution

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Standard deviation