yelloe

x1=75 x2=90 z1=(x1-mean)/standard dev. = -0.35 z2=(x2-mean)/standard dev. = 0.71 then look for the area table from your book, get for the equivalent value from z1 and z2, then get the difference of the two.. 0.7642-0.3632 = 0.401 thus, i assumed its C.