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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.

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