The manufacturer of a medicine wants to test how a new 300-milligram capsule is released into the bloodstream. After a volunteer is given a capsule, blood samples are drawn every half hour, and the number of milligrams of the drug in the bloodstream is calculated. The results obtained are as follows.

Approximate the average number of milligrams in the Bloodstream during the first 3 1/2 hours
Round all calculations to 2 decimal places

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Time t N(t) (mg) Time t N(t) (mg) (hr) (hr) 2.0 178.3 0.5 247.3 2.5 113.9 1.0 270 3.0 56.2 1.5 236.4 3.5 19.3