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I am a starter in maths. I am doing pretty good in all other topics except for probability. I don't know why I am always confused in it. My exams are nearby and I still cant solve simple problems. Can any one help me to solve this please?

Airline passengers arrive randomly and independently at the passenger-screening facility at a major international airport. The mean arrival rate is 10 passengers per minute. identify the appropriate random variable and the probability distribution for the same. hence answer the following. 1)What is the probability of no arrivals in a minute period? 2)What is the probability of no arrivals in a 15 second period? 3)What is the probability of at least one arrival in a 15 second period?

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    This might help http://en.wikipedia.org/wiki/Poisson_process2012-07-24
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    I am confused on what values I should take for the variable? Mean has given. But what values I have to take?2012-07-24

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