问答题

设随机变量X1,X2…,Xn独立同分布,E(Xi)=μ,D(Xi)=σ2,i=1,2,……n,令,则=______,=______,=______。

A.174.24.96:6088/Latex/latex.action?latex=XGJhcntYfT1cZnJhY3sxfXtufVxzdW1fe2k9MX1ee259WF97aX0sU197bn1eezJ9PVxmcmFjezF9%0D%0Ae259XHN1bV97aT0xfV57bn0oWF97aX0tXGJhcntYfSleMg%3D%3D'
B.174.24.96:6088/Latex/latex.action?latex=RShcYmFye1h9KQ%3D%3D'
C.174.24.96:6088/Latex/latex.action?latex=RChcYmFye1h9KQ%3D%3D'
D.174.24.96:6088/Latex/latex.action?latex=RShTX3tufV4yKQ%3D%3D'
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