a. Explain the Global Minimum variance Portfolio. b. Why should an investor invest in a portfolio in the efficient frontier? c. Consider the following scenario Normal Market Bull Market 0.5 0.3 Probability Walton Singer Bear Market 0.2 -20% -15% 18% 20% 50% 40% 1. Calculate risk (Standard Deviation) and return (expected rates of return) for Walton ii. Calculate risk (Standard Deviation) and return (expected rates of return) for Singer