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10 cards from this deck
nnn large and ppp small
λ=np\lambda = npλ=np
np≤10np \leq 10np≤10
λxe−λx!\frac{\lambda^x e^{-\lambda}}{x!}x!λxe−λ
(nx)px(1−p)n−x\binom{n}{x} p^x (1-p)^{n-x}(xn)px(1−p)n−x
Simplifies calculations for large nnn, small ppp
Rare events over time or space
Mean and variance
When nnn small or ppp large
Forgetting factorial x!x!x! in denominator
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