Question 1152486
For 70th percentile or highest 30 per cent z=0.52
z=(x-mean)/sd
0.5244=(x-395)/22
11.54=x-395
x=406.54 gm 

middle 70% is from 15 to 85 per cent. Use symmetry and figure 1
z.15 is -1.036
-22.80=x-395
x=372.20 gm
the other value, the 85th percentile, is 395+22.80=417.80 gm.  That is range.

highest 90% is z=1.282
28.20=(x-mean)
x=423.20

Lowest 20% is -0.8416=z
-18.52=x-395
x=376.48 gm