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A set of values has a mean of 250 and a standard deviation of 50. What value has a z-score of -2.4? What is redox series? A 500 mL sample of water is found to contain 0.02 g of Pb. What is the concentration of Pb in the solution? Can you get liquid mercury from a fluorescent lightbulb containing mercury? A positive angle less than 2pi that is coterminal with 23pi/3 is?