If it is assumed that 60 percent of those who receive a questionnaire by mail will respond and 750 responses are needed, what is the minimum number of questionnaires that should be mailed?  Choices: A) 1160 B) 1190 C) 1220 D) 1250 E) 1280
Let x be the minimum number of questionnaires to be mailed.   0.6x = 750   x = 1250   The answer is 1250.
<result>D</result>
If it is assumed that 60 percent of those who receive a questionnaire by mail will respond and 750 responses are needed, what is the minimum number of questionnaires that should be mailed?