plz ASAP

As part of an annual review of its accounts, a discount brokerage selects a random sample of 56 customers. Their accounts are reviewed for total account valuation, which showed a mean of $36000, with a sample standard deviation of $8000. What is a 99% confidence interval for the mean account valuation of the population of customers? (Round the final answers to the nearest whole dollar.) 998 confidence interval for the mean account valuation is between $ and $