should be below average most of the time you can draw this all so differently so drawing in this kind of 3d like sketches is sometimes hard to do much easier to draw contours so the contours of the densities shown below the kind of 3d plot then here's a corresponding density contour for the middle one and for the last one you see indeed the ellipse runs along that main diagonal how about some other examples here is negative correlation so here it runs along the opposite axis when x1 is above average x2 is below average and so we get it to