Chemistry
Chemistry, 30.03.2021 15:50, cooper2017

"Air pollution ~ A chemical plant is required to maintain sulfur dioxide levels in the working environment atmosphere at an average level of no more than 0.15 parts per million (ppm). Safety engineers measure the levels at a randomly chosen 15 intervals each week. If the sample mean sulfur dioxide level is more than 0.168 ppm, the safety protocols say that the plant will be evacuated while the air is scrubbed and machines are adjusted"

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