The table shows data from a concession stand, representing weekly sales (x) in dollars and profit (y) in dollars. A 2-column table with 9 rows. Column 1 is labeled x with entries 1,250, 1,485, 1,535, 1,880, 1,950, 2,005, 2,425, 2,535, 2,675. Column 2 is labeled y with entries 755, 905, 930, 1,140, 1,175, 1,215, 1,480, 1,535, 1,625. When using the median-fit method with summary points (1,485, 905), (1,950, 1,175), and (2,535, 1,535), what is the approximate slope of the best-fit model? StartFraction 18 Over 31 EndFraction Three-fifths Five-thirds StartFraction 31 Over 18 EndFraction