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Unformatted text preview: STT 201 UNIT 2 Example Multiple Choice Questions 1.3. A fair coin is tossed three times. 1. The sample space is (a) {H, T} (b) {HH, HT, TH, TT} (c) {1/2, 1/2} (d) {HHH, HTH, HHT, THH, TTH, THT, HTT, TTT} 2. What is the probability of getting exactly two H’s? (a) 1/8 (b) 2/8 (c) 3/8 (d) 4/8 (e) none of these 3. What is the probability of getting at least two H’s? (a) 1/8 (b) 2/8 (c) 3/8 (d) 4/8 (e) none of these 45 . A blood bank catalogs the types of blood, including positive or negative Rhfactor, given by donors during the last five days. The number of donors who gave each blood type is listed in the following table. A donor is selected at random. Blood Type O A B AB Total Rhpositive 156 139 37 12 344 Rhnegative 28 25 8 4 65 Total 184 164 45 16 409 4. What is the probability that the donor has type O or type A blood? (a) 0.85 (b) 0.45 (c) 0.40 (d) 0.84 (e) none of these 5. What is the probability that the donor has type B blood or is Rhnegative? (a) 0.16 (b) 0.25 (c) 0.11 (d) 0.27 (e) none of these 68. In a group of 40 people, 8 are lefthanded. Two people are selected from the group one after the other with replacement. 6. What is the probability that both people selected are lefthanded? (a) 0.08 (b) 0.04 (c) 0.25 (d) 0.02 (e) 5 7. What is the probability that one person is righthanded and one is lefthanded? (a) 0.16 (b) 0.11 (c) 0.76 (d) 0.22 (e) 0.32 8. What is the probability that at most one person is righthanded? (a) 0.47 (b) 0.36 (c) 0.24 (d) 0.98 (e) 0.80 910. Assume that 60% of a large student body are men. Four students are to be selected at random, one after the other. Let w denote a woman and m denote a man. 9. The probability of the (ordered) outcome wmww is closest to (a) 1/8 (b) 1/16 (c) 3 ) 4 . )( 6 . ( (d) 3 ) 4 . )( 6 . ( 4 (e) 0.5 10. The probability of selecting 3 women is (a) 1/8 (b) 1/16 (c) 3 ) 4 . )( 6 . ( (d) 3 ) 4 . )( 6 . ( 4 (e) 0.5 1114. Consider a large population of children and the characteristic y = age. Suppose that age is distributed as follows in the population: y 2 3 5 p(y) 0.3 0.5 11. Find the missing probability. (a) 0.3 (b) 0.5 (c) 0.2 (d) 1 (e) none of these 12. If one child is selected at random from the population, what is the probability he/she is 3 years old?...
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 Spring '08
 SIKORSKII
 Standard Deviation, Variance, Probability theory, North Dakota, Ybar

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