题目内容:
下列各表中可作为某随机变量分布律的是()A. X |0 1 2
--------------------------
P |0.5 0.2 0.1
B. X |0 1 2
--------------------------
P |0.3 0.5 0.1
C. X |0 1 2
--------------------------
P |1/3 2/5 4/15
D. X |0 1 2
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P |1/2 1/3 1/4
参考答案: