Reliability

What is the reliability of a system with two parts of reliability 0.9 connected in series, which functions only if both work?

  1. A0.81
  2. B0.9
  3. C0.99
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Answer: A. 0.81

A series system functions only when all parts work, so its reliability is the product of the parts' reliabilities: 0.9 × 0.9 = 0.81. This is why systems with many parts require high reliability from each part.

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