=+80. Advertising. A philanthropic organization knows that its donors have an average age near 60 and is considering taking out an ad in the American Association of Retired People

(AARP) magazine. An analyst wonders what proportion of their donors are actually 50 years old or older. He takes a random sample of the records of 500 donors. From the data provided, construct a 95% confidence interval for the proportion of donors who are 50 years old or older.