ok 1.28 because its closes to 0.9 area value, (1 - 0.1) = 0.9
-0.67 because its (1 - 0.75) = 0.25 ... but we use 0.75 as 0.25 is not on the table, and we just make it negative as we'll flip it over anyway so closest to 0.75 is z=0.67, but -0.67 as its on the left side of the mean etc, just draw the graph to imagine it.