On an average 100 customers arrive at a place each hour,

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On an average 100 customers arrive at a place each hour, and on the average the server can process 120 customers per hour. What is the proportion of time the server is idle?.

1. 1 - ρ
2. 1 + ρ
3. ρ
4. None of these

Correct Option: A

The proportion of time the server is idle = 1 - ρ