Suppose your expectations regarding the stock price are as follows: State of Market: Boom, Normal, Recession Probability: Boom: 0.30 Normal: 0.23 Recession: 0.47 Ending price: Boom: $140 Normal: $110 Recession: $80 HPR (including dividends): Boom: 48.5% Normal: 13.5% Recession: -19.5% compute the standard deviation of the HPR on the stocks (do not round intermediate calculations. round your answers to 2 decimal places.)