Changes in airport procedures require considerable planning. Arrival rates of aircraft are important factors that must be taken into account. Suppose small aircraft arrive at a certain airport, according to a Poisson process, at the rate of 7.5 per hour. Thus, the Poisson parameter for arrivals over a period of hours is p=7.5t. Complete parts (a) through (c). Click here to view page 1 of the table of Poisson probability sums Click here to view page 2 of the table of Poisson probability sums. (a) What is the probability that exactly 6 small aircraft arrive during a 1-hour period? The probability is 1367 (Round to four decimal places as needed.) (b) What is the probability that at least 6 arrive during a 1-hour period? The probability is 0.7586. (Round to four decimal places as needed.) (c) If a working day is defined as 10 hours, what is the probability that at least 85 small aircraft arrive during a working day? The probability is N (Round to four decimal places as needed.)

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