5. The annual return on a stock is normally distributed with a mean of 20% and standard deviation of 30%. What is the probability of its actual return being between -30% and 80%? 6. Consider a...

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Extracted text: 5. The annual return on a stock is normally distributed with a mean of 20% and standard deviation of 30%. What is the probability of its actual return being between -30% and 80%? 6. Consider a portfolio of three funds, X, Y, Z, with weights wx, wy, and wz. What is the variance of the portfolio? [Hint: Use the correlation coefficients between these three funds, pxy, pxz, and pyz, to represent it.] 3