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Mathematics 9 Online
OpenStudy (anonymous):

Suppose that the average number of people log in to a particular web site is 5 per minute. What are the mean and variance of the distribution of the number of people log in to this web site? What is the probability that the number of people will log in to this web site is at most 4 in the next minute? What is the probability that the number of people will log in to this web site is between 2 and 5 (inclusive) in the next 2 minutes?

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