Question 1131810
np=mean or 22.8
np(1-p) = variance or 22.8*0.772=17.60
sd= sqrt (V)=4.2
correction factor want mean between 29.5 and 40.5
z=(29.5-30)/4.2 or -0.12
z=(40.5-30)/4.2 or +2.5
probability z is between those values is 0.542