• Homework 4.2: Suppose for the returns (last 24 months) of stock A are 5, 10, -4, 6, -10, 12, 8, 20, -6, 5, 7, -5, -4, 2, -3, 9, -2, -8, 6, -7, 11, 14, -5, 4 (in percentages; for example, the first number 5 means 5%), calculate the standard deviation of returns, i.e., volatility of returns. • Homework 4.3: Calculate the semi-standard deviation.

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