Question 1084190
z=(x-mean)/sd
> = (200-160)/40 which is > =+1 or 0.1587.
===================
>=365 days is (365-160)/40=205/40=5.125 or <0.0001 (1.5 x 10^-7)
==================
between 250 and 320 days is z between 2.25 and 4  or 0.0122
<=(80-160)/40 or < = -2 or 0.0228