What should the long-run ex ante tradeoff between expected return and risk look like in a graph?

Question:

What should the long-run ex ante tradeoff between and risk look like in a graph? What about the long run ex post tradeoff?
Expected Return
The expected return is the profit or loss an investor anticipates on an investment that has known or anticipated rates of return (RoR). It is calculated by multiplying potential outcomes by the chances of them occurring and then totaling these...