Suppose that, on average, 5 persons in 1000 make a numerical error in preparing their income tax returns and 8000 returns are selected at random and examined. Find the mean and variance of the random variable X representing the number of persons among 8000 who make an error in preparing their income tax returns. Assume random variable X follows the Poisson probability model. The mean is (Type an integer or a decimal. Do not round.)

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