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
- A.
5 failures/CPU hr
- B.
10 failures/CPU hr.
- C.
20 failures/CPU hr.
- 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.