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U 2. For a study of a particular pollutant, a researcher wishes to select specimens in the middle 60% of the population based on the

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U 2. For a study of a particular pollutant, a researcher wishes to select specimens in the middle 60% of the population based on the concentration of the pollutant. If the mean concentration is 120ppm and the standard deviation is Sppm, nd the upper and lower values of this range. [Hinti Let 243 be the z-score such that P(zo

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