2021年CFA考试《Level Ⅰ》考试题库-CFA考试（Level Ⅰ）-Study Session 2 Quantitative Methods Basic Concepts-
财会经济-CFA特许金融分析师
单选题-Given the conditional probabilities in the table below and the unconditional probabilities P(Y = 1) = 0.3 and P(Y = 2) = 0.7, what is the expected value of X.
单选题
A.5.0.
B.5.3.
C.5.7.
我个人认为这个应该是：B
解析：E(X | Y = l) = (0.2) (0) + (0.4) (5) + (0.4) (10) = 6 and E(X | Y = 2) = (0.1) (0) + (0.8) (5) + (0.1) (10) = 5
E(X) = (0.3) (6) + (0.7) (5) = 5.30
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