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What is the availability of a software with the following reliability figures?
Mean Time Between Failure (MTBF) = 25 days
Mean Time To Repair (MTTR) = 6 hours

  1. 1%
  2. 24%
  3. 99%
  4. 99.009%
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Availability = MTBF/(MTBF+MTTR) * 100

                  = 25*24/(25*24 + 6) * 100

                  = 99.009 %
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Availability = ( MTTF / MTBF ) * 100 %

MTBF = MTTF + MTTR

So Availability = ( 25 days - 6 hours ) / 25 days * 100 %

= 99 %

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