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标题: [求助]天山4-24 [打印本页]

作者: conquer 时间: 2005-4-28 06:51 标题: [求助]天山4-24

天山4-24请问 Factor Percent of Respondents User-friendly 56% Fast response time 48% Bargain prices 42%

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

如何求解? Ans = A

作者: fdgggd 时间: 2005-4-28 06:54

U + F + B - UnF - UnB - BnF + UnFnB = 1

B- UnB- BnF =1- F- U+ UnF - UnFnB = 1- 56%- 48% +30% (UnFnB=0, 值最大)
B- UnB- BnF =26%

1200x26%=312

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