1. [16) There bus the City Library and 4 o go to the Library to study there, are
ID: 3046047 • Letter: 1
Question
1. [16) There bus the City Library and 4 o go to the Library to study there, are 3 subway routes going fro routes from the Library to the AMC Theater. Jane and then t the Theater at night and then to the Theater? ays can she take going to the Library hrst 2. [16] In a group of blood donors, the record showed that 1 in 5 have 0+, and 1 in 16 have O- blood, whereas 1 in 4 have At, and 1 in 12 have A- blood. A blood donor is selected at random. what is the probability that this selected person has: (a) type O blood? blood? (b) type A+ blood? (c) type A or type O blood? (d) neither type A nor type 3. [24] Let A and B be two events such that P(a)-0.4, P(B)-0.7, and P(AUB)-0.85 Find: (a) P(A nB), (b) P(A" UB"), (c) P(An B"), (d) P(A0lB).
Explanation / Answer
(2)
(a)
P(donor has type O+ blood) = 1/5 = 0.2
(b)
P(donor has type A+ blood) = 1/4 = 0.25
(c)
P(donor has type A or O) = (1/5 + 1/16 + 1/4 + 1/12) = 0.596
(d)
P(donor has neither type A nor O) = 1-0.596 = 0.404
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