OG 139 求教

angelavivi

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

bobiouou

S 在说 R所说的情况是合情合理的，是可能出现的。但是这未必就是alarm factor。因为人们的互相认识，可能导致R所说的情况发生。