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In a paper, the authors defined an exponentialRandomVariable (RV) as [tex]X_1 \mbox{~EXP}(\lambda)[/tex] where [tex]\lambda[/tex] is the hazard rate. What will be the distribution of this RV:

[tex]f_{X_1}(x)=\lambda e^{-\lambda x}[/tex] or

[tex]f_{X_1}(x)=\frac{1}{\lambda} e^{-\frac{x}{\lambda}}[/tex]

Thanks in advance.

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# Exponential RV

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