将一枚硬币重复掷n 次,以 X 和 Y 分别表示正面向上和反面向上の次数, 则 X 和 Y の相关系数等于（）
A.-1
B.0
C.1/2
D.1
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正确答案： A 答案分析：img src="https://img.haodaxue.net/uploadimg/image/20200605/20200605185245_16030.png" alt="" />
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