Homework: Chap... Question 3, Instructor-cr.. HW Score: 33.33%, 10 of 30 points Save O Points: 0 of 1 In a survey of 3394 adults aged 57 through 85 years, it was found that 85.5% of them used at least one prescription medication. Complete parts (a) through (b) below . . . .. a. How many of the 3394 subjects used at least one prescription medication? (Round to the nearest integer as needed.) b. Construct a 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication. %