The concentration of particulate matter (in parts per million) t hours after a factory ceases operation for the day, is given by the following formula, C(t). Find the average concentration for the period from t = 0 to 1 = 6. 12 In (1+ 8) (1+ 812 The average concentration of particulate matter, for the time period from t =0 to t =6, is approximately |parts per million. (Do not round until the final answer. Then round to four decimal places as needed.)