Question: The hydraulic systems in an aircraft have three major modules. Two modules have a reliability of 0.98, and the third has a reliability of 0.99.

The hydraulic systems in an aircraft have three major modules. Two modules have a reliability of 0.98, and the third has a reliability of 0.99.

1. What is the reliability of the hydraulic system?

2. Given the safety-critical nature of an aircraft’s hydraulic system, the manufacturer of the aircraft has decided to add redundant modules to each of the three major modules. If the reliabilities of the backup modules are identical to the original modules, what is the overall reliability of the hydraulic system with the backup modules?

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