Problem 20.11
You toss a fair coin 12 times. Each time the coin lands on heads, you earn five dollars. b. if X measures the amount of money that you have at the end of the game, what is the variance of X? I just don't understand really where to start on this. I have the equation for variance, I just don't see how I can apply that to this and get the solution listed in the back of the book?