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In an airport, average number of flights departed is 5 per hour. The number of airplanes departed follows Poisson distribution. If we select an

In an airport, average number of flights departed is 5 per hour. The number of airplanes departed follows Poisson distribution. If we select an hour randomly, find the probability that the number of airplanes departed would be: (a) exactly 2. (b) less than 4. (c) from 3 to 6.

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