How do I do this Statistics problem?

timer Asked: Oct 29th, 2015

Question description

For a certain urban area, in a random sample of 5 months, an average of 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 nor distributed.

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