Engineering Statistics Home Work 5.6-4 Chapter 5: Discrete Probability Distributions Historical records of severe rainstorms in a town over the last 20 years indicated that there had been an average number of four rainstorms per year. Assuming that the occurrences of rainstorms may be modeled with the Poisson process, what is the probability of two or more rainstorms in the next year? Ans. P(X 2 2; 4) = 0.908

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