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The least-squares regression equation is y = 737.5x + 14,689 where y is the median income and x is the percentage of 25 years and older with at least a 55000- bachelor's degree in the region. The scatter diagram indicates a linear relation between the two variables with a correlation coefficient of 0. 7752. Complete parts (a) through (d). Median Income 25000- 15 20 25 30 35 40 45 50 55 60 Bachelor's 36 (a) Predict the median income of a region in which 30% of adults 25 years and older have at least a bachelor's degree. (Round to the nearest dollar as needed.)