Standard deviation is a statistic that measures the spread of a data set about its mean and is calculated as the square root of the variance. Standard deviation is calculated as the square root of variance by determining the deviation of each data point from the mean.
The proportion of stocks in the optimal risky portfolio is given by:
Ws = LE(Ts) - r/l 0B - |E(B) - r,) Cou(B, S) divided by
E(rs) -rios+ [E(rB) -rilos - (E(rs) - rj+ E(rB) - r/| Cou(B,S)
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