Thirty-four small communities in Connecticut (population near 10,000 each) gave an average of x = 139.5 reported cases of larceny per year. Assume that is known to be 42.3 cases per year.

Find a 90% confidence interval for the population mean annual number of reported larceny cases in such communities. What is the margin of error? (Round your answers to one decimal place.)

lower limit=

upper limit=

margin of error=