A worker at an information booth at the O'Hare Airport in Chicago has found (by collecting data) that he serves an average of 24 customers per hour and notes that he is pretty sure that the arrivals follow a Poisson distribution. He asks his friend to cover for him for an hour while he goes to get a massage. When he returns, his friend insists that he be paid double for the work he did because he is sure that he helped at least 40 customers. According to the Poisson distribution, if the mean is 24 customers/hour, then what is the probability that 40 or more customers arrived in a given hour?
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