A Random Digit Dialing Sample of 1750 Adults Found That

A random digit dialing sample of 1750 adults found that 1140 used some form of prescription medication. Of those who used prescription drugs, 940 said they are concerned about the current state of health care; 320 of the 610 nonusers agreed with this position as well. What is the estimate for the proportion of adults who do not use prescription drugs and who are concerned?

A) 0.183
B) 0.340
C) 0.525
D) 0.537