Carbon monoxide is a major atmospheric pollutant in urban areas. The hourly emission of Carbon Monoxide from a large production plant follow the standart distribution. An environment engineer took a random samle of 20 measurements of the wight per hour of Carbon Monoxide emitted from this plant at different days and times. The sample mean was 120.7 kg and the sample standard deviation was 31.2 kg. Compute the 95% confidence interval for the mean of all hourly emissions of Carbon Monoxide from this plant.

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