1. A stock had returns of 18.79 percent, 7.91 percent, and 24.11 percent for the past three years. What is the standard deviation of the returns?

2. If $10,000 is deposited in a savings account that pays 6% annual interest and all of the interest is left in the account, what is the account balance after 9 years

3. What amount would you need to deposit at 5% interest on January 1, 2016, in order to be able to draw out $2,000 at the end of each year for the next 8 years

4. A small company wants to have enough money saved to purchase a new $500,000 warehouse in five years. If the company can invest money at 18% per year, the amount that must be invested.