请教一个狒狒逻辑的第70题谢谢

从容自适

70. A low-pressure weather system is approaching Plainville; rainfall results from about 70 percent of such systems in the Plainville area. Moreover, the current season, spring, is the time of year in which thundershowers, which sometimes result from low-pressure systems, are most likely to occur in Plainville.

Knowing which one of the following, in addition to the information above, would be most useful for determine the probability that Plainville will have a thundershower soon?

(A) the percentage of thundershowers in Plainville that occur in the spring

(B) the percentage of spring rainfalls in Plainville that are thundershowers

(C) the percentage of thundershowers in Plainville that result from low-pressure systems

(D) whether low-pressure systems in other areas are associated with rainfall

(E) whether Plainville has more or fewer thundershowers each spring than do near by towns

答案选了C我觉得应该选B 理由如下:

 在下雨的天气里面雷震鱼所占的比例  乘以  70%就可以得到plainville即将下雷震雨的比率  难道不是吗

请问哪位有PREP的破解版的逻辑部分呢   有的话能不能传给我  谢谢啦邮箱 yaohuibin2005(ａ) 163.com

[此贴子已经被作者于2008-5-5 23:44:55编辑过]

从容自适

哪位路过的大侠帮忙解答下吧...不胜感激...

fogwind

C直接就给出了其概率了吧。

B,似乎rainfall 和 thundershower 这两个事件不是相互独立，不能用相乘得出其概率。

欢迎大家指正。

even123

题目中说的是in addition to the information above,就是除了题目中

给的信息,选项中哪一个最useful . B必须依赖题目信息，而C却给了

直接信息。个人意见。

jiangmingjia

even123，高！

blogfish

这道题好像是答案给的b，详解给的c，我自己选的c，然后按照题目意思推算又觉得b更对

到底哪个是最佳答案那

shaan

C是最直接的，因为文中第一句话就说了，低压要来了，那么如果知道了低压下雷雨的几率，不是直接就求出来了，还用求降雨的几率吗？呵呵

qqbeauty

大家误会了，C的意思是”雷阵雨由于低气压产生的”比率，而不是”低气压产生雷阵雨的比率”，答案确定B

machaelsonic

qqbeauty说的是正解!

我也刚做完狒狒的这道题,是应该选B, 详解给的答案不对

C the percentage of thundershowers in Plainville that result from low-pressure systems

可能thundershowers 一年有一百次, 但只有一次是低气压造成的, 知道了这个1%并不能知道低气压能在多大概率上带来thundershowers

B是说春季降水是thundershowers的概率是多少, 乘以题干中的低气压会70%带来降水, 能得到低气压带来thundershowers 的概率

zsx

The answer should be B.