STAT 3502 Midterm: 3502_Midterm_2018f_A
13 Feb 2019
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Answer key - version (a: the probability that a visit to a primary care physician"s (pcp) o ce results in neither lab work nor referral to a specialist is 35%. Of those coming to a pcp"s o ce, 30% are referred to specialists and 40% require lab work. Calculate the probability that a visit to a pcp"s o ce results in both lab work and referral to a specialist. (a) 0. 05 (b) 0. 12 (c) 0. 18 (d) 0. 25 (e) 0. 35. Solution: we have p (l r ) = 0. 35, p (r) = 0. 35 and p (l) = 0. 4. As p (l r ) = p ((l r) ) = 1 p (l r), therefore, p (l r) = 1 0. 35 = 0. 65. What is the probability that a randomly selected full-time student takes no more than four courses? (a) 0. 40 (b) 0. 14 (c) 0. 30 (d) 0. 70 (e) 0. 25. Solution: let x be number of courses that full-time students take.
