Aresearcher wants to investigate the mercury contamination in a certain species of fish in a lake Asample of 53 fish was selected and the mean mercury concentration was found to be 0 525 and standard deviation 0349. A 95% confidence interval would be Oa (0.431, 0619) Ob.(0.314, 0.519) Oc Background conditions are not satisfied therefore the problem cannot be solved. O d. (0.210. 0.517)

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