Suppose that a random sample of eighteen recently sold houses in a certain city has a mean sales price of$285,000, with a standard deviation of$9000. Under the assumption that house prices are normally distributed, find a90% confidence interval for the mean sales price of all houses in this community. Then find the lower limit and upper limit of the90% confidence interval.

Carry your intermediate computations to at least three decimal places. Round your answers to the nearest whole number. (If necessary, consult alist of formulas.)

Lower limit: $_____

Upper limit: $ _____