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14) What is the 8-hour time-weighted average for the following set of air samples for asbestos fibers? The air level during the 1-hour lunch period

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14) What is the 8-hour time-weighted average for the following set of air samples for asbestos fibers? The air level during the 1-hour lunch period was assumed to be zero and therefore no sampling occurred. Sample # Fibers/ml Minutes 1 3.5 81 2 1.9 114 3 1.5 98 4 1.1 127

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