A random sample of 126 police officers subjected to constant inhalation of automobile exhaust fumes in downtown Cairo, had an average blood lead level concentration of 29.2 μg/dl. Assume x, the blood lead level of a randomly selected policeman, is normally distributed with a standard deviation of σ = 7.5 μg/dl. Historically, it is known that the average blood lead level concentration of humans with no exposure to automobile exhaust is 18.2 μg/dl. Construct 90% confidence interval estimator for average blood lead level.

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