Question 1131588
Probability of 0.992 is with a z-value of +2.41
mean is 165
sd is 15, sqrt(V)
as question is written, want MORE than the value found.  That means the amount of hours is at the z value of -2.41.
z<=(x-mean)/sd
-2.41=(x-165)/15
-36.15=x-165
x=128.85 hours
That has a 99.2% probability of being exceeded.