You find a certain stock that had returns of 9%, -16%, 21% and 17% for four of the five years. (Assume the returns are normally distributed) a. If the average return of the stock over this period is 10.3%, what was the stocks return for missing year? b. What is the standard deviation of stock return? c. What is the probability that next year return will be between 10.3% and 25.77%? d. What is the probability that next year return will be between -5.17% and 25.77%?