The variance of failure time (time to failure) of an electric motor in shovel is 1600 hr2. If the failure time follows an exponential distribution. the expected mean time between failure in hr is
A. 40
B. 80
C. 800
D. 1600
Answer: Option A
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A. Unique optimal solution
B. Multiple optimal solution
C. Unbounded solution
D. Infeasible solution
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