The stock of business adventures sells for $40 a share. Its likely dividend payout and end-of-year price depend on the state of the economy by the end of the year as follows: Dividend Stock Price Boom $2.80 $48 Normal Economy 1.80 43 Recession .90 34 a) calculate the expected holding-period return and standard deviation of the holding period return. all three scenarios are equally likely. (Do not round up intermediate calculations. round your answers to 2 decimal places.) Expected return .... standard deviation ... b) calculate the expected return and standard deviation of a portfolio invested half in business adventures and half in treasury bills. the return on bills is 5%. (do not round up intermediate calculations. round your answers to 2 decimal places.) Expected return .... standard deviation ...