In a recent year, potentially dangerous commercial aircraft incidents (e. g., near collisions) averaged 1.2 per 100,000 flying hours. Let X be the number of incidents in a 100,000-hour period. (a) Justify the use of the Poisson model. Each collision is dependent on the occurrence of another. Collisions are routine systematic occurrences. Near collisions are random and independent events. (b) What is the probability of at least one incident