A recent survey found that, despite airline requests, about 40% of passengers don’t fully turn off their cell phones during takeoff and landing (although they may put them in “airplane mode”). The two passengers across the aisle (in seats A and B) clearly do not know each other.
a) What is the probability that the passenger in seat A does not turn off his phone?
b) What is the probability that he does turn off his phone?
c) What is the probability that both of them turn off their phones?
d) What is the probability that at least one of them turns off his or her phone?