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The questions in the title, but when it says n is large, when does it become large and when it says p is small how about then? This is about the Edexcel S2 when using approximations, I think I remember someone saying n is more than 50 and p is less than 0.1 for those to apply, is that right?

say you have a distribution (X) where X~Po(?) you can approximate this to binomial so long as "n is large and p is small" which basically means that there is a large group for which there is a small probability of an event happening

conditions are generally - n>50 and np (lambda)<5

conditions are generally - n>50 and np (lambda)<5

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