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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 : Effectiveness of a flu vaccination

A researcher wishes to test the effectiveness of a flu vaccination. 150 people are vaccinated, 180 people are vaccinated with a placebo, and 100 people are not vaccinated. The number in each group who later caught the flu was recorded. The results