【每日一练】CFA 一级(2015年)
Question:
The probability of Event A is 40%. The probability of Event B is 60%. The joint probability of AB is 40%. The probability (P) that A or B occurs, or both occur, is closest to:
A. 60%.
B. 40%.
C. 84%.
Answer = A
P(A or B) = P(A) + P(B) – P(AB) = 0.40 + 0.60 – 0.40 = 0.60 or 60%.
CFA Level I
"Probability Concepts," Richard A. DeFusco, Dennis W. McLeavey, Jerald E. Pinto, and David E. Runkle
Section 2
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