Question 566380
20 bills in total


$1--12/20
$2--5/20
$20-2/20
$50-1/20


*[tex \LARGE E(x) = \sum x_ip(x_i)]


*[tex \LARGE = 1(\frac{12}{20}) + 2(\frac{5}{20}) + 20(\frac{2}{20}) + 50(\frac{1}{20})]


*[tex \LARGE = \frac{112}{20} = 5.6]