[stevven]

z2=x-m/a
=111-100/10
=1.1
p(0<z<1.1) l
p(z1<z<0)l
0.6223-0.3643=0.258
z1=0.7
z=x-m/a
-0.7=a-100/10
a-100=-7
a=100-7=93