Global occurrence of anti-infectives in contaminated surface waters: Impact of income inequality between countries The following is a histogram of 1995 concentrations of antibiotics from pooled data from different regions in the world (values are log-transformed). (a)  Find the mean and standard deviation for the concentrations of antibiotics.  (b) Compute the interval (x¯ − 2s, x¯ + 2s). (c) What percentage of the observations fall within the interval in (b)? Justify your answer in one sentence

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