The stock of Blackboard sells for $80 a share, its lkely dividend payout and end-of-year price depend on the state of the economy by the end of the year as follows: Calculate the standard deviation of the holding period return. Assume that all three scenarios are equally likely. Note: You can first put the numerical answer for each question in the answer bax. Then show your steps - your choice on this but if you do so, you can receive partial redat if your numerical onswer is incorrect