Sunday, June 3, 2007

Question 40

Consider a system for which the mean time between failures (MTBF) is given by x and the mean time to repair (MTTR) is given by y. Due to changes in conditions of use, both the MTBF and the MTTR have gone up by a factor of 1.5. Which of the following is the correct availability rate for the new conditions of use?

a) Although it varies depending on the value of x and y, the availability rate has a higher value than the previous availability.
b) The availability rate is the same as the previous availability rate.
c) The availability rate is 1.5 times the previous availability rate.
d) The availability rate is 2/3 times the previous availability rate.

answer

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