chance of gold = 1/36
chance of silver = 9/36
chance of black = 26/36
1/36 * 3 + 9/36 * 2 - 26/36 * 1
3/36 + 18/36 - 26/36
= -5/36
:(
A bag contains 1 gold marbles, 9 silver marbles, and 26 black marbles. Someone offers to play this game: You randomly select one marble from the bag. 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?
1 answer
1 answer