| Favorable | Unfavorable | Not Sure | Candidate M | 40 | 20 | 40 | Candidate N | 30 | 35 | 35 |
The table above shows the results of a survey of 100 voters each responded “favorable” or “unfavorable” or “not sure” when asked about their impressions of candidate M and of candidate N. What was the number of voters who responded “favorable” for both candidates? (1) The number of voters who did not respond “favorable” for either candidate was 40. (2) The number of voters who responded “unfavorable” for both candidates was 10 和GWD这题基本是一样的~ 这里选NO的人就是did not respond “favorable” 除了1n2n的,就剩下一是二否,一否二是,和两个是 那么1是的人数和2是的人数就是经常用的那个交集,1是加2是减1、2都是的人数就是全集(即总人数减两个否的) |