Assume that a program will experience 200 failures in infinite time. It has…

2014

Assume that a program will experience 200 failures in infinite time. It has now experienced 100 failures. The initial failure intensity was 20 failures/CPU hr. Then the current failure intensity will be

  1. A.

    5 failures/CPU hr

  2. B.

    10 failures/CPU hr.

  3. C.

    20 failures/CPU hr.

  4. D.

    40 failures/CPU hr.

Attempted by 136 students.

Show answer & explanation

Correct answer: B

Model used: failure intensity is proportional to the number of remaining faults.

Steps to compute the current failure intensity:

  • Total initial faults = 200.

  • Failures already experienced = 100, so remaining faults = 200 - 100 = 100.

  • Initial failure intensity = 20 failures/CPU hr corresponds to the full set of 200 faults.

  • Current intensity = initial intensity × (remaining faults / initial faults) = 20 × (100 / 200) = 20 × 0.5 = 10 failures/CPU hr.

Final answer: 10 failures/CPU hr.

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