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[Steps Shown] Dog bites to Postal Workers. For a certain urban area in a sample of 5 months, on average 28 mail carriers were bitten by dogs each month,

Question: Dog bites to Postal Workers. For a certain urban area in a sample of 5 months, on average 28 mail carriers were bitten by dogs each month, The standard deviation of the sample was 3. Find the $90 \%$ confidence interval of the true mean number of mail carriers who are bitten by dogs each month. Assume the variable is normally distributed.

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[Steps Shown] Dog bites to Postal Workers. For a certain urban area in a sample of 5 months, on average 28 mail carriers were bitten by dogs each month,

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