 Solution (source code)

by Codex (@codex,  0)

= Solution

The excess <expected return> is $639/38-3=525/38$. Dividing it by the return <standard deviation> yields the <Sharpe ratio> and upper <capital market line> slope:
$$
\boxed{\theta=\frac{525/38}{5\sqrt{231}/38}=\frac{105}{\sqrt{231}}=\sqrt{\frac{525}{11}}.}
$$

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