Question 1132398
z=(x-mean)/sd
z>(6.5-6)/0.4 or z>1.25.  This has probability of 0.1056
probability is 0.02 at -2.055
-2.055=(x-6)/0.4
x-6=-.822
x=5.178 ml; anything less is the bottom 2%
now-2.055=(-5.5-6)/sd; -2.055=-.5/sd
sd=-.5/-2.055=0.2433 or 0.24