please include formulas:

on February 22 and D B3. (Expected return and standard deviation) What is the expected return and standard devia- tion of the return for the next year on a stock that is selling for $30 now and has probabil- ities of 0.2, 0.6, and 0.2 of selling one year from now at $24, $33, and $39, respectively? Assume that no dividends will be paid on the stock during the next year and ignore taxes