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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 ?
Some one take me step by step on this question.
Based on long term experience, the standard deviation can be taken to be $2.92. Find a 90% confidence interval for the average amount left by all groups.
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