Mathematics, 26.05.2020 14:57 aliviadushane

The level of nitrogen oxides and non methane organic gas in the exhaust over the useful life of cars of a particular model varies Normally with mean 90 mg/mi and standard deviation 4 mg/mi. A company has 25 cars of this model in its fleet. Find the level L such that the probability that the average NOX + NMOG level x for the fleet greater than L is only 0.03?

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