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10 questions from this quiz
How far values typically fall from mean
σ2\sigma^2σ2
Square metres
sd(X)=Var(X)\text{sd}(X) = \sqrt{\text{Var}(X)}sd(X)=Var(X)
σ\sigmaσ
Var(X)=E(X2)−μ2\text{Var}(X) = E(X^2) - \mu^2Var(X)=E(X2)−μ2
Variance and standard deviation
Middle 50%
IQR=Q3−Q1\text{IQR} = Q_3 - Q_1IQR=Q3−Q1
Not affected by extreme values in tails
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