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(3)I is an isotope that beta decays to Xe with a half life of 8 days. A small amount of the (3)I serum is injected into the blood of a patient. The activity of the amount injected is 2.4x10^5Bq. The iodine distributes through the blood quickly through the blood (less than ½ hour). After 11.5 hours 2.5ml of blood is drawn which give an activity of 115Bq. The total volume of blood is approximately n liters, n=? (n can be any number between 1 and 9, inclusively.)

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