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he average age of a sample of n = 84 mayors was x = 51.7 years with a standard deviation of s = 6.3 years.

he average age of a sample of n = 84 mayors was x = 51.7 years with a standard deviation of s = 6.3 years. Assuming the ages are normally distributed, find the 95% confidence interval (including units) of the mean age of all mayors. State the distribution used.

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