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UGC NET CSE | June 2014 | Part 3 | Question: 17

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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. 5 failured/CPU hr
  2. 10 failured/CPU hr
  3. 20 failured/CPU hr
  4. 40 failured/CPU hr
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Ans:- B
Explanation:- The formula for Current Failure Intensity = 
Initial Failure intensity X [ 1 – Experienced failures/Failures in infinite time ]
= 20 X [ 1 – 100/200 ]
=20 X (100/200) 
=10 failures /CPU hr

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Vo =200 failures 
µ = 100 failures 
λo = 20 failure/CPU hr.
current failure intensity = λ0(1- µ/Vo)
=20(1-100/200) = 20(1-0.5) = 10 failures/CPU hr

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