The reliability function R(t), also known as the survival function S(t), represents the probability a unit survives beyond time t.
R(t) = 1 - F(t)
The reliability of a series system is the product of the reliability functions of the components because all of the components must survive in order for the system to survive. To calculate the reliability of a series system of independent components, multiply the reliability functions of all the components together.
| F(t) || cdf for the chosen distribution |