8. Measurement of total organic carbon in surface water is carried out within one week shows the following results: Day to Concentration 1 2.15 1.85 3 3.35 4.45 2.35 6 5.65 7 2.15 8 1.95 3.55 10 2.25 11 0.55 12 1.45 13 2.45 14 3.45 15 1.85 Calculate: The average value and its uncertainty with confidence intervals of 95%, 90%, and 99%. 2. 4

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A:

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