单项选择题

设X的概率密度为,则a=(    )
   A.   B.     C.    D.

A.174.24.96:6088/Latex/latex.action?latex=Zih4KT1cZnJhY3thfXt4XnsyfSsxfSh44oiIUik%3D'
B.C.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7MX17XHNxcnR7z4B9fQ%3D%3D'
D.E.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7Mn17z4B9'
F.G.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7MX17z4B9'
H.I.174.24.96:6088/Latex/latex.action?latex=XGZyYWN7Mn17XHNxcnR7z4B9fQ%3D%3D'
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