单项选择题

设x₁，x₂，x₃是取自总体x容量为3的一个样本，则总体均值E(X)的无偏估计值是( )
A． B．
C． D．

A.B.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7MX17Nn14X3sxfS1cZnJhY3syfXs2fXhfezJ9K1xmcmFjezV9ezZ9eF97M30%3D'
C.D.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7MX17Nn14X3sxfStcZnJhY3syfXs2fXhfezJ9K1xmcmFjezJ9ezN9eF97M30%3D'
E.F.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7MX17M314X3sxfStcZnJhY3sxfXszfXhfezJ9K1xmcmFjezF9ezN9eF97M30%3D'
G.H.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7MX17Nn14X3sxfStcZnJhY3s0fXs1fXhfezJ9LVxmcmFjezN9ezV9eF97M30%3D'

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