Please complete the following assignment.1. Describe the difference between repairable...

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Please complete the following assignment.1. Describe the difference between repairable and
non-repairable items. What kind of effect might this difference have on
reliability? List examples of repairable and non-repairable items in our
everyday life. (10 points)

2. Explain the difference between reliability and durability
and how they can be specified in a product development program. (10 points)

3. A space vehicle requires five out of its six main engines
to operate in order to achieve orbit. If each engine has a reliability of 0.98,
determine the reliability of achieving orbit. (20 points)

4. What is the probability of having not more than 20 but
not less than 10 failures if n=100, p=0.14 for a binomial distribution? (20 points)

5. What is the probability of having not more than 20 but
not less than 10 failures if n=100, p=0.14 for a normal distribution (mean=np,
variance=npq)? (20 points)

6. In the question 3, we
assume the six engines are independent. Please describe three factors that
could invalidate this assumption. And how will it affect the results you have
in question 3 if the independent assumption is invalid? (20
points)

David · Accepted Answer

1. Describe the difference between repairable and non-repairable items. What kind of effect 
might this difference have on reliability? List examples of repairable and non-repairable 
items in our everyday life (10 points) 
Answer:  
NON-REPAIRABLE REPAIRABLE 
Discarded (recycled) upon 
failure 
Restored to operating 
conditions without replacing 
entire system 
Lifetime is random variable 
described by single time to 
failure 
Lifetime is age of system or 
total hours of operation 
Group of systems – lifetime 
assumed independent & 
identically distributed (from 
same population) 
Random variables of interest 
are times between failure and 
number of failures at 
particular age. 
Failure rate is hazard rate of a 
lifetime distribution – a 
property of time to failure 
Failure rate is rate of 
occurrence of 
failures (ROCOF) – a property 
of a sequence of failure times
Examples of non-repairable systems would be “one-shot” devices like light bulbs or more 
complex devices like pacemakers.  Examples of repairable systems are computers,

Please complete the following assignment. 1. Describe the difference between repairable and non-repairable items. What kind of effect might this difference have on reliability? List examples of...

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