2. an online bookstore sells both print books and e-books (books in an electronic format). customers can pay with either a gift card or a credit card.
a. suppose that the probability of the event "print book is purchased" is 0.6 and that the probability of the event "customer pays using gift card" is 0.2. if these two events are
independent, what is the probability that a randomly selected book purchase is a print book paid for using a gift card?
b. suppose that the probability of the event "e-book is purchased" is 0.4; the probability of the event "customer pays using gift card" is 0.2; and the probability of the event "e-book is
purchased and customer pays using a gift card" is 0.1. are the two events "e-book is purchased" and "customer pays using a gift card" independent? explain why or why not.