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Problem 12E: Chapter: CH6 Problem: 12E Refer to Exercise. a. What is the probability that a customer does not use a credit card? b. What is the probability that a customer pays in cash or with a credit card? Exercise Shoppers can pay for their purchases with cash, a credit card, or a debit card. Suppose that the proprietor of a shop determines that 60% of her customers use a credit card, 30% pay with cash, and the rest use a debit card. a. Determine the sample space for this experiment. b. Assign probabilities to the simple events. c. Which method did you use in part (b)