Question 1204164
for 2.2% on either side, this is a z=-2.015 and z=2.015
distance from the mean is z*sigma or 2.015*0.9=1.8135 in or 1.81 inches
the minimum is 3.89 in, the maximum is 7.51 inches 
can check with normalcdf (3.89,7.51,5.7,0.9)