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Probability distribution of the time

Suppose that earthquakes occur in the western U.S. In accordance with a Poisson distribution with a mean of 2 per week. A) find the probability that at least 3 earthquakes occur during the next 2 weeks. B) find the probability distribution of the time, until the next earthquake.

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## Q : Result of a particular examination

In a class of 50 students, the result of a particular examination is a true mean of 70 and a true variance of 12. It is desired to estimate the mean by sampling, without replacement, a subset of the scores.