Math 3371

In a certain year, 26% 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 3,000 teenagers, what number of teenagers without checking accounts can it expect to find? _2220_ teenagers

What is the standard deviation σ of this number? (Round the standard deviation to one decimal place.)
σ = _____

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

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