Tim Trepid is highly risk-averse while Mike Macho actually enjoys taking a risk. Investments Returns: Expected Value Standard Deviation Buy stocks $ 9,450 $ 6,540 Buy bonds 7,520 2,660 Buy commodity futures 19,400 22,400 Buy options 14,900 16,600 a-1. Compute the coefficients of variation. (Round your answers to 3 decimal places.) Coefficient of Variation Buy stocks Buy bonds Buy commodity futures Buy options a-2. Which one of the following four investments should Tim choose? Buy bonds Buy stocks Buy commodity futures Buy options b. Which one of the four investments should Mike choose? Buy bonds Buy stocks Buy commodity futures Buy options