A A game of chance offers the following odds and payoffs. Each play of the game costs $100, so the net profit per play is the payoff less $100. Probability Payoff Net Profit 0.10 $500 $400 0.50 $100 0 0.40 0 -100 What are the expected cash payoff, and expected rate of return. Calculate the variance and standard deviation of this rate of return.