Question 1040610
Binomial mean is np=0.72*500=360
Variance is np(1-p)=360*0.28=100.8
sd is sqrt (100.8)=10.04
69% of 500 is 345.
This becomes a problem where the z= (x-mean)/sd, with x=345, mean 360, and sd 10.04
z<(-15/10.04)=-1.494
This is .0676.  B is the choice.  If I use 10 as the SD, and not 10.04, I get 6.68%
=========================