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10 cards from this deck
Variance and standard deviation
Average squared distance from mean
σ2=∑(xi−xˉ)2n\sigma^{2} = \frac{\sum (x_i - \bar{x})^{2}}{n}σ2=n∑(xi−xˉ)2
Square root of variance
cm2\text{cm}^{2}cm2
Same as original data
Data widely spread
Data tightly clustered near mean
Non-negative
Calculate the mean
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