The following data give the times between successive failures of an aircraft air-conditioning unit: 48, 29, 502, 12, 70, 21, 29, 386, 59, 27, 153, 26 and 326 hours. When a unit fails it is repairedin situ.
Repairs can be assumed to be instantaneous.
a. Examine the distribution of failure times, treating the unit as a component on the aircraft.
b. Examine the trend of failures, viewing the air- conditioning system itself as a repairable system.
c. Describe clearly the conclusions to be drawn from both these analyses.