Cakio Inc. would like to launch a new product line. They found the following alternatives to do so.

Alternative	Expected Return	Standard Deviation of Return
Trucks	21%	6%
Steamrollers	22%	8%
Pavers	15%	5%

Calculate the coefficient of variation for trucks.

An investment has returned 5%, 3%, 4%, 6%, and 7% in each of the last five years, respectively. We have decided that we want to use historical returns as a proxy for expected future returns. What is the expected rate of return?