A bag contains 5 gold marbles, 8 silver marbles, and 31 black marbles. Someone offers to play this game: You randomly select one marble from the bag. If it is gold, you win $3. If it is silver, you win $2. If it is black, you lose $1. What is your expected value if you play this game? (Note: Include a dollar sign in your answer and round to the nearest penny. If your answer is negative, put the negative sign first, like -$3.50.)