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02-01-2023
SAT

Answered

The environmental protection agency requires that the exhaust of each model of motor vehicle be tested for the level of several pollutants. the level of oxides of nitrogen (nox) in the exhaust of one light truck model was found to vary among individually trucks according to a normal distribution with mean 1. 45 grams per mile driven and standard deviation 0. 40 grams per mile.

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