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12 cards from this deck
Spread/variation in data from the mean
Data clustered close to the mean
Data spread out over wider range
σ\sigmaσ (sigma)
68%
95%
99.7%
σ=Σ(x−xˉ)2n\sigma = \sqrt{\frac{\Sigma(x - \bar{x})^2}{n}}σ=nΣ(x−xˉ)2
σ=Σf(x−xˉ)2Σf\sigma = \sqrt{\frac{\Sigma f(x - \bar{x})^2}{\Sigma f}}σ=ΣfΣf(x−xˉ)2
Calculate the mean (xˉ)(\bar{x})(xˉ)
Square each deviation
No, it cannot be negative
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