It has been determined that a disease affects 0.2% of a given population.We perform screening tests randomly, with replacement, in the population in question which is2000 people. Let X be the number of sick people, according to the test. 1) Explain why we can approximate X by a Poisson distribution, for which you will give the parameter λ.   2)Using a Poisson distribution, calculate the probability of finding at least 1 affected person in this group of 2000 people?

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