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Suppose small aircraft arrive at a certain airport according to a Poisson process with a rate of A = 8 per hour. (Round your answers to 3 decimal places, if needed.) (a) What is the probability that exactly 9 small aircra arrive during a 1-hour period? D What is the probability that at least 9 small aircraft arrive during a 1-hour period? D What is the probability that at least 10 small aircraft arrive during a 1-hour period? D (b) What are the expected value and standard deviation of the number of small aircraft that arrive during a 80-min period? Expected value = C] Standard deviation = C] (c) What is the probability that at least 28 small aircra arrive during a 25-hour period? C] What is the probability that at most 12 small aircraft arrive during a 25-hour period? :l