Exam 2 Sample Q's Stt 201

Exam 2 Sample Q's Stt 201 - STT 201 UNIT 2 Example Multiple...

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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 Hs? (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 Hs? (a) 1/8 (b) 2/8 (c) 3/8 (d) 4/8 (e) none of these 4-5 . A blood bank catalogs the types of blood, including positive or negative Rh-factor, 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 Rh-positive 156 139 37 12 344 Rh-negative 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 Rh-negative? (a) 0.16 (b) 0.25 (c) 0.11 (d) 0.27 (e) none of these 6-8. In a group of 40 people, 8 are left-handed. Two people are selected from the group one after the other with replacement. 6. What is the probability that both people selected are left-handed? (a) 0.08 (b) 0.04 (c) 0.25 (d) 0.02 (e) 5 7. What is the probability that one person is right-handed and one is left-handed? (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 right-handed? (a) 0.47 (b) 0.36 (c) 0.24 (d) 0.98 (e) 0.80 9-10. 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 11-14. 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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Exam 2 Sample Q's Stt 201 - STT 201 UNIT 2 Example Multiple...

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