1. **State the problem:**
Calculate the expected value of the winnings from a spinner with 10 equal regions: 3 red, 4 blue, 2 yellow, and 1 green.
2. **Formula for expected value:**
$$E(X) = \sum (x_i \cdot P(x_i))$$
where $x_i$ is the value of outcome $i$ and $P(x_i)$ is the probability of outcome $i$.
3. **Identify values and probabilities:**
- Red: win 4, probability $\frac{3}{10}$
- Green: win 2, probability $\frac{1}{10}$
- Blue: lose 3, probability $\frac{4}{10}$
- Yellow: lose 1, probability $\frac{2}{10}$
4. **Calculate expected value:**
$$E(X) = 4 \times \frac{3}{10} + 2 \times \frac{1}{10} + (-3) \times \frac{4}{10} + (-1) \times \frac{2}{10}$$
5. **Simplify each term:**
$$= \frac{12}{10} + \frac{2}{10} - \frac{12}{10} - \frac{2}{10}$$
6. **Combine terms:**
$$= \frac{12 + 2 - 12 - 2}{10}$$
$$= \frac{0}{10}$$
7. **Final answer:**
$$E(X) = 0$$
The expected value of the game is 0, meaning on average the player neither wins nor loses money over many spins.
Expected Value 0975B5
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