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How was this statistic computed? Is it based on the formula
Q = 1 - (1 - x/y)^26 = 1/3200,
where
If this is the case, then the human beings occupy a proportion R = 1 - {1 - 1/3200}^(1/26) of the surface of the earth, which is about 1/100,000.
What if instead of hitting one human being, we change problem to falling less than 20 centimeters away from one human being? This is an interesting coverage problem in the theory of statistics. And the damage from a 1 kg of iron hitting earth at 5 miles per second is probably as bad if it falls 20 centimeters away from you, than directly on you.
Source: http://news.cnet.com/8301-19514_3-20110804-239/heads-up-nasa-satell...
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