The required rate of return is what an investor would require to be compensated for the risk borne by holding the asset; "expected return" is often used in this sense, as opposed to the more formal, mathematical, sense above.
In this case, expected return is a measure of the relative balance of win or loss weighted by their chances of occurring.
For example, suppose we have the option of choosing between three mutually exclusive investments: One has a 60% chance of success and if it succeeds it will give a 70% ROR (rate of return).
When investors make judgments on the various returns on investments, they should guard against being blinded by past performance and must ensure that they take all or most of the following considerations into account".
[2] In economics and finance, it is more likely that the set of possible outcomes is continuous (any numerical value between 0 and infinity).