Question

a box contains five one dollar bills, nine five dollar bills, ten ten dollar bills, and nine twenty dollar bills. what is the expectation if one bill is selected.
$10.00
$9.00
$11.00
$12.00

Answer 1

here we have to compute this:
\[{\text{expectation}} = \frac{{5 + 5 \times 9 + 10 \times 10 + 9 \times 20}}{{33}} = \frac{{330}}{{33}} = 10\]