Suppose an audit process is taking place at a small airport, andthe head
auditor arrives randomly throughout the day and assesses theoperation of the airport.
She shows up in one-hr intervals at a time. The time betweenaircraft arrivals at this
small airport is exponentially distributed with a mean of 75minutes. You may assume
the operation of the small airport is independent of the timeinterval under consideration.
What is the probability that at least four aircrafts arrivewithin an hour?
What is the probability that more than three and less than sixaircrafts arrive within an
hour?
