Statistics and probability
Standard deviation
The square root of variance, measuring the typical spread of observations around their mean in the original units.
Common notation σ=√(Σ(xᵢ−μ)²/N)
In one sentence
What does Standard deviation mean?
The square root of variance, measuring the typical spread of observations around their mean in the original units.
How it is written
σ=√(Σ(xᵢ−μ)²/N)
A compact example
A dataset whose values cluster near the mean has a smaller standard deviation.
Other names and search terms
SD.
Clear answers
Questions about Standard deviation
What does Standard deviation mean in mathematics?
The square root of variance, measuring the typical spread of observations around their mean in the original units.
How is Standard deviation written?
A common notation is σ=√(Σ(xᵢ−μ)²/N).
What is an example of Standard deviation?
A dataset whose values cluster near the mean has a smaller standard deviation.