3. If a person rolls doubles when she tosses two dice, she wins $10. For the game to be fair, how much should she pay to play the game?

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**Question 3:** If a person rolls doubles when she tosses two dice, she wins $10. For the game to be fair, how much should she pay to play the game?

### Explanation:

In this problem, we need to determine the fair cost to play a game involving rolling two dice. The player wins $10 if she rolls doubles.

1. **Probability of Rolling Doubles:**
   - There are 6 possible doubles when rolling two six-sided dice: (1,1), (2,2), (3,3), (4,4), (5,5), (6,6).
   - The total number of outcomes when rolling two dice is \(6 \times 6 = 36\).
   - Therefore, the probability of rolling doubles is \(\frac{6}{36} = \frac{1}{6}\).

2. **Expectation:**
   - To find the fair cost, calculate the expected winnings of the game.
   - Winning $10 has a probability of \(\frac{1}{6}\).
   - Thus, the expected winnings are \(10 \times \frac{1}{6} = \frac{10}{6} = \frac{5}{3} \approx 1.67\).

3. **Fair Cost:**
   - For the game to be fair, the cost to play should be equal to the expected winnings.
   - Therefore, the fair cost is approximately $1.67.
Transcribed Image Text:**Question 3:** If a person rolls doubles when she tosses two dice, she wins $10. For the game to be fair, how much should she pay to play the game? ### Explanation: In this problem, we need to determine the fair cost to play a game involving rolling two dice. The player wins $10 if she rolls doubles. 1. **Probability of Rolling Doubles:** - There are 6 possible doubles when rolling two six-sided dice: (1,1), (2,2), (3,3), (4,4), (5,5), (6,6). - The total number of outcomes when rolling two dice is \(6 \times 6 = 36\). - Therefore, the probability of rolling doubles is \(\frac{6}{36} = \frac{1}{6}\). 2. **Expectation:** - To find the fair cost, calculate the expected winnings of the game. - Winning $10 has a probability of \(\frac{1}{6}\). - Thus, the expected winnings are \(10 \times \frac{1}{6} = \frac{10}{6} = \frac{5}{3} \approx 1.67\). 3. **Fair Cost:** - For the game to be fair, the cost to play should be equal to the expected winnings. - Therefore, the fair cost is approximately $1.67.
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