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An environmental engineer measured the BOD of water discharge from a wastewater treatment plant. They reported that the mean value of their measurements was 8.5

An environmental engineer measured the BOD of water discharge from a wastewater treatment plant. They reported that the mean value of their measurements was 8.5 mg/L with a standard deviation 2.7 mg/L Assuming that the data was normally distributed What is the ikelihood of having a reading smaler than 8.5 mgL3

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