In an Italian breakfast café, a waitress has observed that 80% of her customers order coffee and 25% of her customers order both biscotti and coffee. Define
A = a randomly selected customer orders coffee.
B = a randomly selected customer orders biscotti.

a. Express the waitress's observations as probability statements involving events A and B.

b. What is the conditional probability that a randomly selected customer would order a biscotti, given that he or she orders coffee?

c. What is the conditional probability that a customer would not order a biscotti, given that he or she orders coffee?