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To find the probability that a flight that departs on schedule also arrives on schedule, we can use the formula for conditional probability:
P(arrives on schedule | departs on schedule) = P(arrives on schedule and departs on schedule) / P(departs on schedule)
Given that 81% of flights depart on schedule and 69% of flights arrive and depart on schedule:
P(arrives on schedule | departs on schedule) = 0.69 / 0.81 = 0.85
Therefore, the probability that a flight that departs on schedule also arrives on schedule is 0.85.