Goods train are coming in a yard at the rate of 25 trains per day.
The inter arrival time follows exponential distribution. The service
rate follows an exponential distribution with an average of 30
minutes. The yard can admit 9 trains at a time (there being 10 lines,
one of which is reserved for shunting purposes). What is the
probability that the yard is empty and find the average queue length
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I think that the answer is 457
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