Carbon monoxide co emissions for a certain kind of car vary, Ask an Expert

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Carbon monoxide (CO) emissions for a certain kind of car vary mean 2.4 g/mi and standard deviation 0.7g/mi. A company has 60 of these cars in its fleet. Let y represent the mean CO level for the companies fleet. Estimate the probability that y is between 2.5 and 2.6/mi.

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