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I am just confused about all the formulas about exponential distribution and poisson distribution. Here's the problem: Average number of hits each minute is 0.5, what is the probability that the waiting time for the next hit is more than 3 minute?

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    The problem is not clear. Is the waiting time between hits iid exponential?2012-12-16
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    I think it's just the first hit.2012-12-16
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    e^(-1.5). $ $ $ $2012-12-16
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    how do you get that? where does 1.5 come from? Do we need integration?2012-12-16
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    Andy: When are you going to stop putting questions on the site without any explanation about where you are stuck, what you tried, what you know?2012-12-16
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    it's very clear in the title, i don't know which formula to use.2012-12-16

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