求教GWD数学一题

eaky · 发表于 2009-11-21 14:08:53

Q35:
For what percent of those tested for a certain infection was the test accurate; that is, positive for those who had the infection and negative for those who did not have the infection?
(1) Of those who tested positive for the infection, did not have the infection.
(2) Of those tested for the infection, 90 percent tested negative.

选E，说实话题目没怎么看懂。。。到底是要求positive和negative分别的比例还是test accurate(accuracy?)
谢谢！

求教GWD数学一题

所属分类: GMAT考试

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