3. (20 pts.) There are three subsystems in a serial assembly process, whose reliability characteristics are as given below: Subsystem 1: Failure Rate = 4 failures / 1,000 hrs. Subsystem 2: Failure Rate = 6 failures / 2,000 hrs. Subsystem 3: Failure Rate = 1 failure / 1,000 hrs. i. Calculate the composite failure rate for the assembly process. ii. Calculate the probability that the process will survive for 40 hours without failure