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10 cards from this deck
Value that can only take certain fixed values (countable)
When its value depends on chance
List/formula of all outcomes of XXX and their probabilities
E(X)=SigmaxpE(X) = Sigma xpE(X)=Sigmaxp
Mean score per turn/throw
E(X2)=Sigmax2pE(X^2) = Sigma x^2 pE(X2)=Sigmax2p
extVar(X)=E(X2)−E(X)2 ext{Var}(X) = E(X^2) - E(X)^2extVar(X)=E(X2)−E(X)2
When you have the entire population data
When estimating population parameters from a sample
s^2 = rac{n}{n-1} sigma^2
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