Question 1138189
mean is np=3.2  expected number of late flights
variance is np(1-p)=3.2*0.8=2.56
sd is sqrt (V)=1.6
at least 8 flights arrive late with expected value of 3.2 and sd of 1.6

normal approximation z>(8.5-3.2)/1.6, using continuity correction factor
This is z>3.3125
probability is 0.0005 or 0.001