15. Suppose you project a real timber harvest revenue from your timberland in 20 years with the following probabilities: a 5 percent chance that revenue will be between $0 and $500; a 20% chance of $1,000 to $2,000; a 40% chance of $1,000 to $2,000; a 35% chance of $2,000 to $3,000. What is your expected value of this harvest