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 a random sample of 325 letters mailed were delivered the day after they were mailed

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 a random sample of 325 letters mailed were delivered the day after they were mailed. Based on this compute a 90% confidence interval for the proportion of all letters mailed that were delivered the day after they were mailed. Then answer the following.

A. What is the lower limit of the 90% confidence interval?
B. What is the upper limit of the 90% confidence interval?