in a survey 01 3191 adults aged 57 through 85 years. it was found that 30.5% of them used at least one prescription medication. Complete parts (a) through (c) below. E>~- a. How many of the 3191 subjects used at least one prescription medication? [I (Round to the nearest integer as needed.) b. Construct a 90% condence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication. D%