THE POISSON EQUATIONS

Poisson approximation
X~B(n,p)=~Poisson(np)
P(X=k)=(n*p^h*(1-p)^(n-h))/(k!*(n-k)!)
=(n(n-1). . .(n-k+1)(np)^h(1-(np/n))^(n-h))/((n.n...n)k!)
~((np)^h*e^(-np))/k!

Poisson
X~Poisson(l)
P(X=k)=(e^(-l)*l^k)/k!=0,1,. . .
E[X]=l, Var(X)=l

***l=lamda
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