A survey organization, as part of the United States Census Bureau, conducts a yearly census similar to the one taken every ten years, but with a smaller percentage of participants. One of these surveys estimates with 90% confidence that the mean household income in the U.S. falls between $69,721and $69,923. Find the point estimate for mean U.S. household income.

Find the sample mean:

Find the error bound for mean U.S. household income.