设X的数学期望与方差均存在,则在下列结论中正确的是 ( ) -题库考试答案搜索网

设X的数学期望与方差均存在,则在下列结论中正确的是 ( )

单选题

2021-07-17 23:31

A、E(X<sup>2</sup>)<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1511146541936005b8be3e0484c24b3c6b7ae229d32b5image1.png">0
B、D(X<sup>2</sup>)>0
C、E(X) <img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/1511146546556a6646c6e9bd04d3f8191758c210d5786image2.png">0
D、D(X)>E(X)

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正确答案

A

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标签：土木工程专升本工程数学 2019级毕业清考（考试分）安全工程建筑工程技术高起专水利水电工程水利水电建筑工程 2019级毕业清考汽车服务工程给排水科学与工程资源勘查工程道路桥梁工程技术

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