Why can mean and standard deviation alone fix every probability of a normal return, and where do real stock returns break that promise?
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Covariance and correlation, bounded by and
Write both definitions, sketch the scatter plots for , , and , and state what low or negative correlation does to the fluctuations of a portfolio.
The four probability bands of the normal distribution
State that mean and variance fix every normal probability, list the 68%, 90%, 95% and 99% bands at 1.00, 1.65, 1.96 and 2.58 standard deviations, and apply one band to illustrative numbers.
Fat tails in GM monthly returns
Describe the GM histogram against the normal curve with the same mean and variance, record how much more often months of −15% and −20% occur than normality predicts, and call normality an approximation.