The following table shows the time between failures for a software system. The reliability of the system for one hour of operation, assuming an exponential model, is
| Error number | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Time since last failure (hours) | 6 | 4 | 8 | 5 | 6 |
Pick an option to check yourself, or open the answer below.
Show answer & explanation
Correct answer: C. e^(−5/29)
Explanation
MTBF = (6 + 4 + 8 + 5 + 6)/5 = 29/5 hours, so λ = 5/29 per hour. R(1) = e^(−λ·1) = e^(−5/29).More Software Engineering questions
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