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During a routine check of the fluoride content of Gotham City\'s water supply, the following results were obtained from replicate analyses of a single sample: 0.511 mg/L, 0.489 mg/L, 0.511 mg/L, 0.481 mg/L, and 0.511 mg/L Determine the mean and 90% confidence interval for the average fluoride concentration in this sample.

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