Question 1162651
z=(x-mean)/sd
=(100-142)/28=-1.5 
prob z< -1.5 is 0.0668

z is -47/28 to -32/28
or -1.68 to -1.14
probability is 0.0807

inv norm for 0.400 is z=-0.253
-0.253=(x-142)/28
-7.084=x-142
x=134.916

z=0.842
0.842=(x-142)/28
x=165.576