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Question 17.SP.2: A recent engineering change at Sullivan Wrist Calculator pla...

A recent engineering change at Sullivan Wrist Calculator places a backup component in each of the two least reliable transistor circuits. The new circuits will look like the following in Figure 17.SP.2a.

What is the reliability of the new system?

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Reliability = [.9 + (1 – .9) × .9] × .95 × .98 × [.9 + (1 – .9) × .9] × .99
= [.9 + .09] × .95 × .98 × [.9 + .09] ×.99
= .99 × .95 × .98 × .99 × .99
= .903

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