Teenage Marketing 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...

Teenage Marketing 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 teenagerswithout 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.

Jun 08, 2022

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Teenage Marketing 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...

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