A system consists of components A and B connected in series, as shown in the following schematic illustration. The lifetime in months of component A is log-normally distributed with µ = 1 and ? = 0.5, and the lifetime in months of component B is lognormally distributed with µ = 2 and ? = 1. The system will function only so long as A and B both function.





a. Generate, by simulation, a large number (at least 1000) of system lifetimes.

b. Estimate the mean system lifetime.

c. Estimate the probability that the system fails within 2 months.

d. Estimate the 20th percentile of system lifetimes.

e. Construct a normal probability plot of system lifetimes. Is the system lifetime approximately normally distributed?

f. Construct a histogram of the system lifetimes. Is it skewed to the left, skewed to the right, or approximately symmetric?




(a) Answers will vary.
(b) ? 2.7
(c) ? 0.34
(d) ? 1.6
(e) System lifetime is not approximately normally distributed.
(f) Skewed to the right.

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