Question 1171704
the half-interval is z(0.95)*sqrt(p(1-p)/n)
z is 1.645
p=0.5
1.645*sqrt(0.25/n)=0.04
sqrt(0.25/n)=0.0243
square both sides
0.25/n=0.00059127
n=422.81 round to 423.