Question: It is important to model machine downtime correctly in simulation studies. Consider a single-machine-tool system with repair times (in minutes) that can be modeled by

It is important to model machine downtime correctly in simulation studies.

Consider a single-machine-tool system with repair times (in minutes) that can be modeled by an exponential distribution mean = 60.

Of interest is the mean repair timeof a sampleof 100 machine breakdowns.

What is the probability that the mean repair time is no longer than 30 minutes?

A.0.6

B.0.2

C.0.5

D.0

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