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4. A scientist is studying the number of elk that use a certain wilderness trail during the summer. Suppose that the number of elk seen each day has a Poisson

distribution with parameter m = 16. a. What is the probability that the number of elk he sees in a day is between 15 and 20, inclusive? (1 point) b. What is the mean and variance of the number of elk he sees each day? (2 points)

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