1. when a call is received at an airline’s call center, the probability that it comes from abroad is 0.32, and the probability that it is to make a change to an existing reservation is 0.38.
a. suppose that you are told that the probability that a call is both from abroad and is to make a change to an
existing reservation is 0.15. calculate the probability that a randomly selected call is either from abroad or is to make a change to an existing reservation.
b. suppose now that you are not given the information in part (a), but you are told that the events "the call is from abroad" and "the call is to make a change to an
existing reservation" are independent. what is the probability that a randomly selected call is either from abroad or is to make a change to an existing reservation?