Bella bought several books. The cost of each book was `$12.83`, `$28.16`, `$15.15`, `$15.22`, and `$15.81`. What is the mean price of the books Bella bought?
$
Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity