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10 cards from this deck
How far values fall from the mean
σ2\sigma^2σ2
Var(X)\sqrt{\text{Var}(X)}Var(X)
σ\sigmaσ
Var(X)=E(X2)−μ2\text{Var}(X) = E(X^2) - \mu^2Var(X)=E(X2)−μ2
Same units
Q3−Q1Q_3 - Q_1Q3−Q1
Spread of middle 50% of distribution
25th percentile (first quartile)
75th percentile (third quartile)
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