Tim Trepid is highly risk-averse while Mike Macho actually enjoys taking a risk. Investments Buy stocks Buy bonds Buy commodity futures Buy options Returns: Expected Value $ 8,970 7,410 22,700 13,100 Standard Deviation $ 6,270 2,480 30,900 14,700 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? O Buy bonds O Buy stocks O Buy commodity futures O Buy options b. Which one of the four investments should Mike choose? Buy bonds O Buy stocks Buy commodity futures O Buy options