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Problem #3 (20 points) - A Reliability Problem A certain component of a machine has a lifetime that is exponentially dis
tributed with a mean of 10 hours. When this component fails, the machine
is stopped and the component must be replaced. Suppose that the replace—
ment time is uniformly distributed between 25 and 35 minutes. In addition,
company policy is to replace the component after 15 hours of operation even
if it has not failed. Run 10 simulations to mimic the replacement of 100 such
components. Use your simulations to determine: a.) (5 points) the average total time of the simulation, b.) (5 points) the average number of components that must be replaced during
the first five days of operation, c.) (5 points) the average time (in hours) that a component is used, and
d.) (5 points) the average percent of the time the machine is idle. Hint: You may use the fact that a sample X from an exponential dis- tribution with mean a can be computed from a random number R using
X = —aln(R).

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