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【单选题】
下列选项可以做离散型随机变量分布表的是A.
X 1 2 3 P 0.3 0.5 0.2
B.
X 1 2 3 P 0.2 0.1 0.2
C.
X 1 2 3 P 0.3 0.4 0.4
D.
X 1 2 3 P 0.7 0.5 -0.2
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