If it is assumed that 50 percent of those who receive a questionnaire by mail will respond and 300 responses are needed, what is the minimum number of questionnaires that should be mailed?
Pick one
A) 400  B) 420  C) 480  D) 500  E) 600
Minimum no of mail to be sent for getting 300 responses at 50%   = 300/0.5= 
<gadget id="calculator">300/0.5</gadget>
<output>600</output>
600   Option 600
<result>E</result>
If it is assumed that 50 percent of those who receive a questionnaire by mail will respond and 300 responses are needed, what is the minimum number of questionnaires that should be mailed?