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请教，这里面试一个什么数学问题？
Roland: The alarming fact is that 90 percent of the people in this country now report that they know someone who is unemployed. Sharon: But a normal, moderate level of unemployment is 5 percent, with 1 out of 20 workers unemployed. So at any given time if a person knows approximately 50 workers, 1 or more will very likely be unemployed.
(B) unemployment is not normally concentrated in geographically isolated segments of the population
B is the best answer. Sharon’s argument assumes that people are generally similar in how likely they are to have among their acquaintances people who are unemployed. Since heavy concentrations of unemployment in geographically isolated segments of the population would produce great differences in this respect, Sharon’s argument assumes few, if any, such concentrations
[此贴子已经被作者于2006-9-18 23:52:58编辑过] | 
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发表于 2006-9-18 23:52:00
