Each year, a magazine compiles a list of the 400 richest Americans. As of September 19, 2012, 8 of the top 10 are as shown in the following table. Complete parts (a) through (c) below. Person Wealth ($ billions) Christy Walton and family 27.9 Warren Buffett 46.0 Charles Koch 31.0 David Koch 31.0 S. Robson Walton 26.1 Bill Gates 66.0 Jim Walton 26.8 Alice Walton 26.3 a. Find the mean. The mean is (Type an integer or decimal rounded to two decimal places as needed.) b. Find the median. The median is (Type an integer or decimal rounded to two decimal places as needed.) c. Find the mode(s). Select the correct choice below and, if necessary, fill in the answer box within your choice. OA. The mode(s) is(are) (Type an integer or a decimal. Do not round. Use a comma to separate answers as needed.) OB. There is no mode.