Template:Weibull reliable life

The Weibull Reliable Life
The reliable life, $$ T_{R} \,\!$$, of a unit for a specified reliability, R, starting the mission at age zero, is given by:


 * $$ T_{R}=\gamma +\eta \cdot \left\{ -\ln ( R ) \right\} ^{ \frac{1}{\beta }} $$

This is the life for which the unit/item will be functioning successfully with a reliability of R. If R=0.50, then $$ T_{R}=\breve{T} $$, the median life, or the life by which half of the units will survive.