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As part of an annual review of its accounts, a discount brokerage selects a random sample...

As part of an annual review of its accounts, a discount brokerage selects a random sample of 31 customers. Their accounts are reviewed for total account valuation, which showed a mean of $33,900, with a sample standard deviation of $8,700. (Use t Distribution Table.)

What is a 99% confidence interval for the mean account valuation of the population of customers? (Round your answers to the nearest dollar amount.)

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