Template:Lognormal distribution mean: Difference between revisions

Latest revision as of 05:07, 13 August 2012

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-===The Mean or MTTF===
+#REDIRECT [[Lognormal Distribution Functions]]
-The mean of the lognormal distribution,  <math>\mu </math> , is given by [18]:
-::<math>\mu ={{e}^{{\mu }'+\tfrac{1}{2}\sigma _{{{T}'}}^{2}}}</math>
-The mean of the natural logarithms of the times-to-failure, <math>\mu'</math> , in terms of  <math>\bar{T}</math>  and  <math>{{\sigma }_{T}}</math>  is givgen by:
-::<math>{\mu }'=\ln \left( {\bar{T}} \right)-\frac{1}{2}\ln \left( \frac{\sigma _{T}^{2}}{{{{\bar{T}}}^{2}}}+1 \right)</math>