Suppose you want to estimate the probability that a randomly selected customer at a particular grocery sore will pay by credit card. Over the past 3 months, 70,600 purchases were made, and 22,200 of them were paid for by credit card. What is the probability that a randomly selected customer will pay by credit card?
a. 0.3144
b. 0.5391
c. 0.7233
d. 0.8548
e. 0. 8633