设离散型随机变量的概率分布为<img data-latex="P(X=k)=\frac {k+1} {10}" data-qs-formula="true" src="data:image/png;base64,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" style="vertical-align: middle;">,<img data-latex="k=0,1,2,3" data-qs-formula="true" src="data:image/png;base64,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" style="vertical-align: middle;">,则<img data-latex="E(X)" data-qs-formula="true" src="data:image/png;base64,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" style="vertical-align: middle;">=( B )。
·1.8
·2
·2.2
·2.4
出自:西南石油大学土木工程施工与组织(专升本)