quiz1BS-M1_f10 - Econ 506, Section M1 Quiz 1B, Sept., 16,...

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Econ 506, Section M1 NAME:_ SOLUTION_ _____ Quiz 1B, Sept., 16, 2010 Total points: 50 I. (10 points) suppose 40% of population is student and the rest are non-students. Suppose that 20 percent of students and 5 percent of non-students take public transportation. A person who takes the public transportation is chosen at random. What is the probability of this person being student? P (Student | PT) = [ P (PT | Student) P (Student)] / [ P (PT | Student) P (Student) + [P (PT | non- student) P (non student)] = (0.20*0.4) / [(0.2*0.4) + (0.05 * 0.60)] = 73% II. a large group of people is to be checked for two common symptoms of a certain disease. It is thought that 20% of the people possess symptoms A alone, 30% possess symptom B alone, 10% possess both symptoms, and the remainder have neither symptom. For one person chosen at random from this group, find the probabilities: a) (5 points) the person has neither symptom. ) ( B
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quiz1BS-M1_f10 - Econ 506, Section M1 Quiz 1B, Sept., 16,...

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