Multiple Choice Question: If queries sent to a search engine arrive every 15 seconds on the average, what is the probability of waiting less than or equal to 30 seconds?

If queries sent to a search engine arrive every 15 seconds on the average, what is the probability of waiting less than or equal to 30 seconds?

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Orphaned Multiple Choice Questions (MCQ) due to changes of exam system.

It is an overflow structure built across an open channel for the purpose of measuring and controlling the flow.
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