It costs $1,000 to enter the following game of chance, which is based on the outcome of a coin toss (fair coin). If the coin comes up "heads" then you win and walk away with $1,100, which is a 10% rate of return. If the coin comes up "tails," then you lose and walk away with $900, which is a -10% rate of return. What is the standard deviation of the returns? Question 12 options: 9% 15% 30% 10% 5%