As I know, we can appoximate binomial distribution by normal distribution and poisson distribution. But i don't clear it right and which better?
Please help me if you know Thks.
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If the number of trials $n$ is limited and $np>10$, $n(1-p)>10$ use normal approximation.
If the number of trials goes to infinity while the product $np$ remains fixed use poisson approximation.
Read more in wikipedia.