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IIIISCIL 8. Suppose that A and B are mutually exclusive events for which P(A) = .3 and P(B) = .5. What is the probabil- ity that (a) either A or B occurs? (b) A occurs but B does not? (c) both A and B occur? 9. A retail establishment accepts either the American Express or the VISA credit card. A total of 24 percent of its customers carry an American Express card, 61 per- cent carry a VISA card, and 11 percent carry both cards What percentage of its customers carry a credit card that the establishment will accept? 10. Sixty percent of the students at a certain school wear neither a ring nor a necklace. Twenty percent wear a ring and 30 percent wear a necklace. If one of the students is