Suppose that, over a given time interval, we estimate the rate of return parameters for Walmart and Commonwealth Edison stock as:

Walmart: mean $=\mathrm{.}00225,$ variance $=\mathrm{.}0002258$

ComEd: mean $=\mathrm{.}001125,$ variance $=\mathrm{.}000148517$

Does an investor with risk aversion $2$ prefer Walmart or ComEd? How about an investor with risk aversion $8?$ Find a value for the risk aversion such that investors above that value prefer ComEd and investors below that value prefer Walmart.