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試卷名稱：112年 - 國立清華大學 112 學年度學士後醫學系單招試題 考試科目：資訊科學#120021
年份：112年
科目：學士後西醫◆資訊科學
19. (5%) A traffic light can be in one of the three states: Green (G), Red (R), and Yellow (Y). The light changes in a random fashion. At any one time, the light can be in only one state. The experiment consists of observing the state of the light. Let a random variable X(') be defined as follows: X(G)=-1, X(R)=0, X(Y) = π； assume that P(G) = P(Y) = 0.5 P(R), what is P(X ≦ 3)?
(A)1/4
(B) 1/2
(C) 3/4
(D)1
(E) 0
