Who might benefit from supplemental insurance and why?

An airline gathers data on late departures and early arrivals over a month. it finds that the probability of a late departure is 12 percent, the probability of an early arrival is 27 percent, and the probability of both a late departure and an early arrival is 4 percent. which equation shows how to correctly calculate the probability of a late departure or an early arrival? p(late departure or early arrival) = 0.12 + 0.04 p(late departure or early arrival) = 0.12 + 0.27 p(late departure or early arrival) = 0.12 + 0.27 – 0.04 p(late departure or early arrival) = 0.27 + 0.04 – 0.12