In which of the following distribution is the standard deviation equal to the mean?
Response:

• A.Binomial.
• B.Negative binomial.
• C.Poisson.
• D.Exponential.

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Which of the following is NOT an appropriate element in the definition of availability?
Response:

• A.The measure of the ability of a system to achieve mission objectives given the conditions during the mission.
• B.The degree to which the system is in an operable and committable state at the start of a mission.
• C.The probability the system will perform its mission when required.
• D.The ratio of the actual operating time to the scheduled operating time excluding PM.

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Software reliability planning includes all of the following EXCEPT
Response:

• A.Selecting models for data analysis and prediction.
• B.Trade-offs involving cost, schedule, and failure intensity of software products
• C.Modeling acquisition of computer software systems.
• D.Trade-offs of general purpose programs vs. commercially available programs.

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When a bathtub curve is used, one characteristic of the flat center portion of the curve is that during this period Response:

• A.The time of the next failure is predictable from the time of the last failure.
• B.The reliability of the system can be expressed as an exponential function
• C.The equipment can be considered highly reliable.
• D.There can be only one type of failure in the system.

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Failure occur on a system at 75, 79, 83, 85 hours. Assuming normality, one sided and unbiased the lower tolerance limit for 95% reliability with 90% confidence for this sample is:
Response:

• A.60 hours.
• B.63 hours.
• C.100 hours.
• D.96 hours.

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