设随机变量(X,Y)服从二维正态分布N(0,0;1,4;-1/2),随机变量中服从标准正态分布且与X独立的是()
A.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591427617135616.png" />
B.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591427622912724.png" />
C.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591427627596402.png" />
D.[img src="https://img.haodaxue.net/uploadimg/ico/2020/0606/1591427631729601.png" />
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正确答案： C 答案分析：img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606151417_82942.png" alt="" /> [img src="https://img.haodaxue.net/uploadimg/image/20200606/20200606151417_10406.png" alt="" style="white-space:normal;" />
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