EV=sum (probability*outcome)
= 1/6 (25+5+0-10-10-15)
do the math.
You are playing a die game. If you roll 1, then the house pays you $25. If you roll 2, the house pays you $5. If you roll 3, you win nothing. If you roll a 4 or a 5, you must pay the house $10, and if you roll a 6, you must pay the house $15. What is the expected value of this game?
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