During a routine check of the fluoride content of Gotham City's water supply, the given results were obtained from replicate ana
lyses of a single sample: 0.511 mg/L , 0.485 mg/L , 0.509 mg/L , 0.491 mg/L , and 0.521 mg/L . Determine the mean and 90% confidence interval for the average fluoride concentration in this sample.
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