In a certain year, 21% 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.

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