Standard deviation
Leaving Cert Maths · Statistics and Probability
Higher Level
A measure of spread equal to the square root of the average squared deviation from the mean, σ = √(Σ(x - μ)²/n). It carries the same units as the data itself.
Ordinary Level
A measure of how spread out the data values are around the mean. A small standard deviation means most values sit close to the mean.
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