Data Management

A critical circuit in a communication network relies on a set of eight identical relays. If any one of the relays fails, it will disrupt the entire network. The design engineer must ensure a 90% probability that the network will not fail over a five-year period. What is the maximum tolerable probability of failure for each relay?

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  1. the answer is supposed to be 1.3 % but i don't know how this solution is reached.

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  2. P(A) = 0.90 [not failing]
    P(b) = 1 - 0.90
    = 0.10 [failing]
    Answer: 0.10/8
    = 0.0125

    Multiply that to get 1.25 or 1.3%

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