What is the availability of the software with following reliability figures.…
2020
What is the availability of the software with following reliability figures.
Mean Time Between Failures (MTBF) is 20 days
Mean Time To Repair (MTTR) is 20 hours - A.
90%
- B.
96%
- C.
24%
- D.
50%
Attempted by 28 students.
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Correct answer: B
To calculate software availability, use the formula: Availability = MTBF / (MTBF + MTTR). First, convert units to match. MTBF is 20 days (480 hours) and MTTR is 20 hours. Total cycle time is 480 + 20 = 500 hours. Availability = 480 / 500 = 0.96 or 96%.