Template:Ald mean: Difference between revisions

Latest revision as of 03:10, 16 August 2012

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