设X,Y为两个随机变量,D(X)=4,D(Y)=9,相关系数为,则D(3X-2Y)=_______.
考试:国家电网招聘
科目:其他工学类 (电网)(在线考试)
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设X,Y为两个随机变量,D(X)=4,D(Y)=9,相关系数为,则D(3X-2Y)=_______.
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