12 machines are planned to be used for a 60-day production run. The actual operating time is 1440 hours. Upon failure a machine must be returned to the manufacturer for repair. The turnaround time is at least 90 days and an average of 110 days. The per machine failure rate is 0.01 failures per operating hour. (failures follow poisson distributions)
What is the expected number of machines failures during the prodution run?