In a survey of 3084 adults aged 57 through 85 years it was found that 81.9% of them used at least one prescription medication. a. How many of the 3084 subjects used at least one prescription...

In a survey of 3084 adults aged 57 through 85 years it was found that 81.9% of them used at least one prescription medication.

a. How many of the 3084 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

Please show solving steps and if possible what excel functions are used to get these answers.