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10 cards from this deck
Positively skewed (skewed to the right)
Symmetrical
Negatively skewed (skewed to the left)
E(X)=npE(X) = npE(X)=np
extVar(X)=np(1−p) ext{Var}(X) = np(1-p)extVar(X)=np(1−p)
Probability of failure
sigma=sqrtnp(1−p)sigma = sqrt{np(1-p)}sigma=sqrtnp(1−p)
Approximately 95%
Mirror images of each other
Long-run average, not guarantee for single trial
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