In a survey of 3352 adults aged 57 through 85 years, it was found that 84.2% of them used at least one prescription medication Complet parts (a) though() a. How many of the 3352 subjects used at least one prescription medication? 2823 (Round to the nearest integer as needed) b. Construct a 90% confidence interval estimate of the percentage of adults aged 57 through 55 years who use at least one prescription indication p Round to ons decimal place as needed)