若\(X～N(5, \dfrac {1}{5})\)，则\((\)　　\()\) --优优班--学霸训练营

若\(X～N(5, \dfrac {1}{5})\)，则\((\)　　\()\)

A．\(E(X)=1\)且\(D(X)= \dfrac {4}{5}\)

B．\(E(X)= \dfrac {1}{5}\)且\(D(X)=1\)

C．\(E(X)=1\)且\(D(X)= \dfrac {1}{5}\)

D．\(E(X)= \dfrac {4}{5}\)且\(D(X)=1\)

【考点】离散型随机变量的期望与方差

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【解答】请登陆后查看

难度：易

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