GMAT CAT 0825 S4/34
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.
Sharon's argument relies on the assumption that
a)normal levels of unemployment are rarely exceeded
b)unemployment is not normally concentrated in geographically isolated segments of the population
c)the number of people who each know someone who is unemployed is always highter than 90% of the population
d)Roland is not consciously distorting the statistics he presents
e)knowledge that a personal acquaintance is unemployed generates more fear of losing one's job than does knowledge of unemployment statistics.
key B
my choice B
答案是猜对的，但是压根没看懂题干和正确选项的意思，望指点！fficeffice" />

Roland:90%的人都说他们知道有人失业
Sharon:正常的失业率是5%，20个工人就有1个人失业，所以如果一个人认识50个工人，其中就应该有1个或以上的人失业（50*5%=2。5个人）
问Sharon的假设：
（基本和Roland无关，但是Roland的语气是失业的人多，
而Sharon的语气是失业的人不多，正常）
b)失业率一般会正常分布的（即使地域不同），所以无论被调查者身处何方，失业率就是5%。支持5%。
a)正常的失业率很少被超出的，其实也不错的答案，感觉有点过了，如果没有b，就选a了。修正5%。
c)总是超过90%的人知道有人失业，和Roland有点联系，和Sharon无关
d)问的是Sharon的假设，所以Roland 怎么想的没关系
e)如果自己认识的熟人失业要比统计数据带来的恐惧更大，无关选项
分析的乱七八糟fficeffice" />