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: (a) compute the arithmetic mean and (b) indicate whether it is a statistic or a parameter.(a) compute the arithmetic mean and (b) indicate whether it is a statistic or a parameter.

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54 67 48 68 58 39 50 35 25 56 47 66 75 33 46 60 62 65 70 67