Reliability Function

Reliability Function

PR-02
ASPCSPAdvanced

Formula
R(t) = e^(−λt)
When to Use

Calculate the probability that a component or system will survive (not fail) through time t, assuming constant failure rate.

Symbol Legend
SymbolMeaningUnitNote
R(t)Reliability at time t )decimal (0 to 11.0 = 100% reliable
eNatural log base2.718
λFailure ratefailures per unit timeReciprocal of MTBF
tTime period of interesthours or cycles

🔒

Worked Example for Blueprint Members

Blueprint members get full exam-style worked problems, step-by-step solutions, solution videos, common exam traps, and linked practice questions — for every equation.

Join Be Safe ASP | CSP Blueprint™ →