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In an air-pollution study performed at an experiment station, the following amount of suspended benzene-soluble organic matter (in micrograms per cubic meter) was obtained for eight different samples of air: 2.2, 1.8, 3.1, 2.0, 2.4, 2.0, 2.1, 1.2 . Assuming that the population sampled is normal, construct a 90% confidence interval for the corresponding true mean. 0 [1.53 , 2.67] O [1.65 , 2.55] O [1.83 , 2.37] O [1.74 , 2.46] O [1.90 , 2.30] 0 Non of them