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The magnitudes of earthquakes in a region of North America can be modeled by an exponential distribution with mean 2.5 (measured on the Richter scale). If 3 earthquakes occur in a given month, what is the probability that none exceed 5 on theRichter scale? I feel that I should be using the gamma function but I am unsure as to how?

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Hint: Check out the properties of the cumulative distribution function for the exponential distribution. en.wikipedia.org/wiki/… –  Bitrex Dec 1 '13 at 6:10

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