3. From 2000-2019 there were a total of 3071 earthquakes worldwide with a magnitude of 6...

3. From 2000-2019 there were a total of 3071 earthquakes worldwide with a magnitude of 6 or greater, or an average of about 0.42 such earthquakes per day.* Assume that moving forward the total number of such earthquakes to occur over any time period follows a Poisson distribution with an average of 0.42 earthquakes per day. For the remainder of this question, “earthquake” will mean an earthquake with a magnitude of 6 or greater. Define a new random variable as necessary in each part of this question.

(a) What is the probability that there are no earthquakes during a single day?

(b) What is the probability that there are at least three earthquakes during a single week?

FUN FACT: When the number of events over any time interval follow a Poisson distribution, the time between any two events follows an exponential distribution with a mean equal to the reciprocal of the mean for the Poisson distribution. Therefore the time between two earthquakes follows an exponential distribution with an average of about 2.38 days. Answer the following three questions using the exponential distribution.

(d) If an earthquake just occurred, what is the probability that the time until the next earthquake will be more than 12 hours but less than 24 hours? (e) What is the median time between two earthquakes?

*https://www.usgs.gov/natural-hazards/earthquake-hazards/lists-maps-and-statistics

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orchestra answered 1 year ago

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