I'm at my wits-end with this one. I think the solution is staring me in the face, but I just can't get it.
I have a cross table
a1 = 0 b1=65 c1=45 d1=33
a2 = 50 b2=71 c2=52 d2=37
a3 = 75 b3=77 c3=58 d3=41
Column "A" is the percent of Economically Disadvantaged Students in the...