3. Stocks P and Q have the following probability distributions of returns: (10 marks) Probability Rate of Return Stock P Stock Q 30% -3% 20% 25% 11% 9% 19% 14% -10% 16% 4% -2% -9% 13% a. Calculate the standard deviation and variance of returns for each stock. Which stock is considered riskier with respect to total risk? Why? b. According to the coefficient of variation, which stock is considered less risky? Why