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Q: If four groups of vehicles consisting of 5, 10, 12 and 8 cars reported the gaseous pollutant emissions of 1.2 kg, 2.1 kg, 3.0 kg and 1.5 kg per day respectively, then the mean emission of gaseous pollutant from all cars is :
4.43 kg/day
(2) 2.14 kg/day
(3) 4.80 kg/day
(4) 3.12 kg/day