1) A stock's price is $100 at the beginning of a year. There is a 25 percent chance that the price will be $90 at the end of the year, and a 75 percent chance that the price will be $130 at the end of the year. The stock will pay a dividend of $10 during the year.

a. Calculate the stock's expected return.

b. Calculate the standard deviation of the stock's return.