Question 1167695
These sd s correspond to z's of -1.838 and +1.838 from the table. 
z=(x-mean)/sd
1.838=(x-5.9)/0.9
1.654=x-5.9
x=7.554 in for largest size
x=4.246 in for smallest size
answer to 1 decimal place is (4.2 in, 7.6 in)

This is 0.9339 of the area of the normal curve taken out of the middle.