How to calculate this average?

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I'm not sure if there is a term for what I'm trying to calculate, but imagine that there is a game where a win rewards you x points and a loss rewards you y points. If you happen to know that your win rate w for this game is 70%, how can you calculate what the average reward will be? What is that formula?

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I think I figured it out by myself? Is this the correct formula?

$$x̄ = x\cdot w + y\cdot(1 - w)$$