Ater 2000 hours of testing 4 bulbs failed calculate the


Part 1: A technician subjected 100 light bulbs for 4000 hours of testing. After 2000 hours of testing 4 bulbs failed. Calculate the % of failures, failures per unit-hour, and failures per unit-year.

Part 2: An assembly has four components with reliabilities of 0.91, 0.92, 0.94, and 0.96. Each of the four components have a backup component with a reliability of 0.90. Calculate the reliability of the assembly.

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