The number of square feet per house are normally distributed with a population standard deviation of 137 square feet and an unknown population mean. A random sample of 19 houses is taken and results in a sample mean of 1350 square feet.

Find the margin of error for a 80% confidence interval for the population mean.

z0.10z0.10	z0.05z0.05	z0.025z0.025	z0.01z0.01	z0.005z0.005
1.282	1.645	1.960	2.326	2.576

You may use a calculator or the common z values above.

• Round the final answer to twodecimal places.