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A bag contains 2 gold marbles, 10 silver marbles, and 21 black marbles.
Someone offers to play this game:
You randomly select one marble from the bag.
If it is gold, you win $4. If it is silver, you win $3. If it is black, you lose $1.

What is your expected value if you play this game?

$

What is your expected value if you play this game?

$

Get help:

Box 1: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)

Enter DNE for Does Not Exist, oo for Infinity