Final answer:
The graphical representation of expected return and risk, measured by standard deviation, is known as the Efficient frontier.
Step-by-step explanation:
The graphical representation of expected return and risk, as measured by standard deviation, is described by the Efficient frontier. The Efficient frontier is part of the Modern Portfolio Theory (MPT) and is depicted on a graph where the expected return is plotted on the Y-axis and the standard deviation (a measure of risk) is plotted on the X-axis. Each point on the Efficient frontier represents a portfolio that offers the highest expected return for a given level of risk. The Efficient frontier helps investors understand the trade-off between risk and return and to make more informed investment decisions by selecting a portfolio that aligns with their risk tolerance and investment goals.