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 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
favorable unfavorable Not sure CandidateM 40 20 40 CandidateN 30 35 35
多谢了
| favorable | unfavorable | Not sure |
CandidateM | 40 | 20 | 40 |
CandidateN | 30 | 35 | 35 |
这道题目我也没有很好的方法,我的做法是这样的,我选A
(1) 没有选1个“F”的是40人,所以60人至少选了1个F,如果没有人选2个F的话,那总的F数应该是60个,但是表中我们可以看出,40+30=70人,所以多出10个F来。为什么会多出10个F来呢,因为有人多选了个F,又每个人至少选了1个F,所以有10个人选了2个F
(2) 选2个U的是10个人,就是20个U,供55个U,说明还有35个人只选了1个U,一共可以确定的是45个没有选2个F,但是那些选1个U的人选了什么不清楚,所以不能确定选2个F的人数。
所以选A
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