[求助]请教大家费费逻辑的一道题，谢谢

Drakedragon

94. When 100 people who have not used cocaine are tested for cocaine use, on average only 5 will test positive. By contrast, of every 100 people who have used cocaine 99 will test positive. Thus, when a randomly chosen group of people is tested for cocaine use, the vast people is tested for cocaine use, the vast majority of those who test positive will be people who have used cocaine.

A reasoning error in the argument is that the argument

A attempts to infer a value judgment from purely factual premises
B attributes to every member of the population the properties of the average member of the population
C fails to take into account what proportion of the population have used cocaine
D ignores the fact that some cocaine users do not test positive
E advocates testing people for cocaine use when there is no reason to suspect that they have used cocaine
正解是C，请问怎么解的，数学较差，费费详解版没看懂，谢谢解答

Drakedragon

顶一下

Drakedragon

顶一下

Drakedragon

谢谢N兄指点，N兄不如去阅读区看看小弟的问题，已经摆了好几天了，^_^

比目鱼香肉丝

谢谢指导。