From $1927$ to $2021,$ the passive risky portfolio offered an average risk

premium of $8\mathrm{.}87\%$ with a standard deviation of $20\mathrm{.}25\%,$ resulting in a

reward$-$to$-$volatility ratio of $\mathrm{.}44$

If $68\%$ of net worth of a US investor is in risky assets, what is the average

degree of risk aversion of an US Investor?