Final answer:
The expected value of rolling a 2 in the dice game cannot be determined without knowing the corresponding points gained or lost.
Step-by-step explanation:
The expected value of playing a game can be calculated by multiplying the value of each outcome by its probability, and summing those values. In this case, the player wins 5 points if they roll a 3, 4, 10, 11, or 12, and loses 5 points if they roll a 5, 6, 7, 8, or 9. To determine the expected value of rolling a 2, we need to know the probability of rolling a 2 and the corresponding points gained or lost. Since the question does not provide this information, the answer cannot be determined.