Arena simulation, How can my Arena model have exactly the same output each time I run it?



When using the create module with for example the lognormal distribution, and directly dispose all entities, the output is exactly the same when running the model exactly 500 hours for example. However, the output should be variable right?

And I have another question, how are the lognormal mean and lognormal standard deviation for Arena calculated, because when I use my calculated lognormal mean and lognormal standard deviation (which are checked and are correct) the output is much larger than expected. Or does Arena have as input parameter just the normal mean and standard deviation of the data?
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