I have used Excel to try and calculate the result but it says my answers are wrong. Where am I going wrong?

Kyle's Shoe Stores Inc. is considering opening an additional suburban outlet. An aftertax expected cash flow of $100 per week is anticipated from two stores that are being evaluated. Both stores have positive net present values. a. Compute the coefficient of variation for each site. (Do not round intermediate calculations. Round your answers to 3 decimal places.) b. Which store site would you select based on the distribution of these cash flows? Use the coefficient of variation as your measure of risk. Site A Site B Kyle's Shoe Stores Inc