The least-squares regression equation is y^=713.2x+14,510 where y is the median income and x is the percentage of 25 years and older with at least a bacheior's degree in the region. The scatter diagram indicates a linear relation between the two varlables with a correlation coefficient of 0.7258 . Complete parts (a) through (d). (a) Predict the median incomd of a region in which 20% of adults 25 years and older have at least a bachelor's degree. (Round to the rearest dollar as noeded.)