In a certain year, 23% of all teenagers in the United States had checking accounts. Your bank, TeenChex Inc., is interested in t
argeting teenagers who do not already have a checking account. (a) If TeenChex selects a random sample of 1,000 teenagers, what number of teenagers without checking accounts can it expect to find? teenagers What is the standard deviation σ of this number? (Round the standard deviation to one decimal place.)
2*3.14*25+2*3.14*5=188.5 (rounded answer) I substituted 3.14 for pi while typing because there's not a pi key, but use the pi button on your calculator while doing the problem