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A wastewater sample has a COD of 275 mg/L. The following CBOD results were obtained in the lab: 95 mg/L (day 2) and 203 mg/L

A wastewater sample has a COD of 275 mg/L. The following CBOD results were obtained in the lab:  95 mg/L (day 2) and 203 mg/L (day 7).  Provide a rough estimate of the k value for CBOD degradation in the test.  Report to the nearest 0.01 day-1 and do not include units in your answer.

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