Lifetime distribution of a cold standby system of components
StandbyDistribution[dist1, {dist2, …, distn}]
StandbyDistribution[dist1, {dist2, …, distn}, p]
StandbyDistribution[dist1, {dist2, …, distn}, sdist]
StandbyDistribution[dist1, {…, {disti, inactive, disti, active}, …}, …]