Teenage Marketing In a certain year, 32% of all teenagers in the United States had checking accounts. Your bank, TeenChex Inc., is interested in targeting teenagers who do not already have a checking account.

(a) If TeenChex selects a random sample of 4,000 teenagers, what number of teenagers without checking accounts can it expect to find? teenagers What is the standard deviation of this number? (Round the standard deviation to one decimal place.) =

(b) Fill in the missing quantities. (Round your answers to the nearest integer.) There is an approximately 95% chance that between and teenagers in the sample will not have checking accounts.