A machine produces ribbon in which flaws occur randomly at an average rate of one flaw in 100m. Find the probability that there are 3 or more flaws in a randomly chosen 200m of ribbon. Find the length of ribbon such that the probability that it contains no flaws is 0.001.
( Is it possible to use binomial distribution to solve instead of the usual Poisson distribution ?)
Answer : 0.323 and 0.001m by poisson distribution
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