The Grand City Water and Sewer Company selected a random sample of 20 residential customers. Following are the amounts, to the nearest dollar, the customers were charged for water and sewer last month:



50 76 68 54 24 44 75 48 65 24
44 75 48 65 75 24 44 75 46 65



a. Compute the arithmetic mean. (Round your answer to 2 decimal places.)