a 55000-4 The least-squares regression equation is = 755.0x + 12,407 where y is the median income and x is the percentage of 25 years and older with at least a bachelor's degree in the region. The scatter diagram indicates a linear relation between the two variables with a correlation coefficient of 0.8022. Complete parts (a) through (d) Q Median Income FY ran 20000 15 20 25 30 35 40 45 50 55 60 Bachelor's % 1 el (a) Predict the median income of a region in which 20% of adults 25 years and older have at least a bachelor's degree (Round to the nearest dollar as needed.) $