You bought 10 shares of stock A at the beginning of 2021 at a price of $100 per share. At the end of the year, the stock will pay you a $1 dividend or $2 dividend with equal probabilities, and the stock will be worth $110 or $90 with equal probabilities. You will invest in stock A for one year. (Note the amount of dividend is independent of stock price. That is, you equally likely get a $1 or $2 dividend whether the stock price is $110 or $90.) a. What is the expected final return of your portfolio? b. What is the standard deviation for the final return