Q24:

Q.24 The table gives three factors to be considered when choosing an Internet service provider and the percent of the 1,200 respondents to a survey who cited that factor as important.  If 30 percent of the respondents cited both “user-friendly” and “fast response time,” what is the maximum possible number of respondents who cited “bargain prices,” but neither “user-friendly” nor “fast response time?”

A.       312

B.       336

C.      360

D.      384

E.       420

Answer:

请问这个题怎么做啊？ 划了半天图也没划出来。

我做的答案是A,不知道对不对阿~

我的思路是：

只要选了User-friendly 或Fast response time 所占的比例为30%+26%+18%=74%

那也就是剩下26%的人以上两种都没有选咯~

那25%*1200=312是不是正确答案阿

望指正~~

i see,thanks  a  lot !!!!