6. Event A occurs with probability 0.2. Event B occurs with probability 0.8. If A and B are mutually exclusive, then (a) P(A or B) = 1.0. (b) P(A and B) = 0.16. (c) P(A and B) = 1.0. (d) P(A or B) = 0.16. (e) both (a) and (b) are true. 7. If P(A) = 0.24 and P(B) = 0.52 and A and B are independent, what is P(A or B)? (a) 0.1248 (b) 0.28 (c) 0.6352 (d) 0.76 (e) The answer cannot be determined from the information given. 8. People with type O-negative blood are universal donors. That is, 9. any patient can receive a transfusion of O-negative blood. Only 7.2% of the American population has O-negative blood. If 10 people appear at random to give blood, what is the probability that at least I of them is a universal donor? (a) 0 (b) 0.280 (c) 0.526 (d) 0.720 (e) 1 Of people who died in the United States in a recent year, 86% were white, 12% were black, and 2% were Asian. (We will ignore the small number of deaths among other races.) Diabetes caused 2.8% of deaths among whites, 4.4% among blacks, and 3.5% among Asians. The probability that a randomly chosen death was due to diabetes is about (a) 0.96. (b) 0.107. (c) 0.042. (d) 0.038. (e) 0030. 10. In your top dresser drawer are 6 blue socks and 10 grey socks, unpaired and mixed up. One dark morning you pull two socks from the drawer (without replacement, of course!). What is the probability that the two socks match? (a) 0.075 (b) 0.250 (c) 0.500 (d) 0.531 (c) 0.567