Question 1125871
want the z value corresponding to 0.2500 and 0.7500
That is +/-0.675
z=(x-mean)/sd
so 0.675*15.4=(x-96.5)
10.395=x-96.5, x=106.9, for the 75th percentile and positive z
-10.395=x-96.5, x=86.1, for the 25th percentile and negative z