In a survey of 3005 adults aged 57 through 85 years, it was found that 81.7% of them used at least one prescription medication a) How many of the 3005 subjects used at least one prescription...

In a survey of 3005 adults aged 57 through 85 years, it was found that 81.7% of them used at least one prescription medication
a) How many of the 3005 subjects used at least one prescription medication?
b) Construct a 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication.
c) What do the results tell us about the proportion of college students who use at least one prescription medication?