The time between arrivals of large comets on earth is, Ask an Expert

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The time between arrivals of large comets on earth is exponentially distributed with a mean of one year.

A. What is the shorterst period of time during which you have at least 90% probability of seeing a comet?

B. What is the probability that at least three comets arrive during the two- year period 2015-2016 ?

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Category:- Statistics and Probability
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